What next for my build?

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I just reached lvl 70 on an experimental character and am unsure of which way I should go, Ill explain what Im trying to do with it and would like some advice on what I should get next.
I believe that for what Im trying to do the base so far is pretty nice, I build defensive first as this is an invasion character and possibly not very strong, I accept advice on where to go but please no "use something else or remake your build" as I cannot afford it and doubt its possible to (open to suggestions on build idea but still I wont be able to change it), there are 3 items Im not prepared to let go and same for main skills.

So, I have this shadow, he's using
and
with the gems shown, my original intention was to get a corruption of "Gems in this item are Supported by level 10 Faster Casting" and keep it with the gems it has now. As I've corrupted about 10 Lanterns so far and didnt have a single mod corruption, (much less the desired one) and its only one of the possible 19 or so different corruptions, I've started to lvl up a faster casting gem recently which will take the place of the added chaos damage gem. The intention of this char is to proc crit as often as possible, or/and to get chances of burning, freezing and shocking in one attack while exploiting the fact that Glacial cascade can hit several times, its also to make the most out of Lantern (since this is the only gem that can take advantage of all it gives, except the lgoh). I chose some of the nodes I did due to my chest armour:
, currently, Im running a 4l flame totem to both shock stack, tank, distract enemies and mf cull, I intend to 5 or 6 link it, whichever comes first (and perhaps lmp with gmp).
I also cast both Temporal chains and enfeeble with
Which I may never replace unless I get the whispers of doom keystone.
Im sorry for the wall, it feels like im writing a build guide here but I feel as my build might be a bit abnormal one could not give good advice without fully understanding it.
I include a pic next to show my DPS for further criticizing, it also shows which auras I use, for the record, my mana regen is of 180.3 so I keep my Arctic armour low level for now since I can and the slow helps me a bit.



Now comes my tree in the current form, know I need the +30 nodes and cant spec ouf of them, at least for now:

http://poeurl.com/ySGAMXl

I have one free point at the moment but would like ideas as to which way should I go in the long run, since you were nice enough to read this far, I prepared some pics of good candidates to save you just a tiny bit of trouble but Im open for all suggestions.
So here it is, in no specific order as I really dont know which way is wiser to go right now:

Shaper:

40% mana increased regen 1% life regen, bear in mind I have no life regen at the moment.

Arcane Potency cluster:

+50% critical strike chance
+30% critical strike multiplier

Inner Force Cluster:

+21% increased effects of buffs on me which I believe affects all my auras and pseudo-auras.

Static Blows and neighbor shock chance node:

+20% chance to shock for both my main attack and my totem

Hex Master and maybe whispers of doom:

Allows me to not have to recast, with whispers I can drop boots. Maybe not a wise choice for now as I dont have some good boots to replace windscream. Might just be a luxury path.

Shock and Blaze + path node(s):

Each will give +24 to fire and lightning damage respectively and +5 to chance for respective status effect.

Harrier and Nimbleness cluster:

Harrier gives me +6% faster casting and +6 movement speed which I guess is pretty good for lightning warp.
Nimbleness Cluster gives me +12% Faster casting. I am not sure of either though as I dont know speed breakpoints and my searches have been in vain.

Witch Damage, Faster casting and increased area big node:
Actually my screenshot program just failed and wont start again, which means Ill have to leave this for another time - even my computer is getting fed up with this wall of text. Well, I just meant to take a screenie of Blast Radius and Elemental Dominion to whitch other starting point, through Faster casting nodes.
Also had in Mind the Templar nodes in that regard but I guess I really should stop here as I've noticed this has become bigger and scarier than I expected, what monster have I created?

Just hope someone will still give me advice, mainly on which way should I go next on my tree, but also recommendations on which gems to give quality to. (though Im not rich)

Again, Im sorry. I was never good at explaining things in little detail, my friends say that I tend to explain how the universe was made for something perhaps not so complicated.
Hope you are still alive by this point.

Without a doubt Whispers of Doom would make you a stronger character. Problem is that you waited so long to get it. If you're going to get WoD, you should get it earlier so it doesn't take friggan forever to go through those nodes.

Maybe undo some of your previous stuff and get WoD? Then slowly reclaim the ones you gave up? Cuz a new high powered curse is going to be better than any of the other things you're looking at.

Btw, if u get WoD, you should keep the Windscreams and add an additional curse.

"

BearCares wrote:

Without a doubt Whispers of Doom would make you a stronger character. Problem is that you waited so long to get it. If you're going to get WoD, you should get it earlier so it doesn't take friggan forever to go through those nodes.

Maybe undo some of your previous stuff and get WoD? Then slowly reclaim the ones you gave up? Cuz a new high powered curse is going to be better than any of the other things you're looking at.

Btw, if u get WoD, you should keep the Windscreams and add an additional curse.

Damn, now I feel double bad about what I said earlier, thanks for the help.
What do you recommend I undo? and last curse should be elemental weakness right? This is my first multiple curse character.

EDIT: oops edited wrong post in wrong thread earlier