Remove tower maps. Add towers to regular maps.

Since towers will soon be sort of semi-maps with a bad layout, you should remove them and add a chance for a regular map to contain a tower. Add bosses to each and that's it.

IF YOU INSIST on this tower mechanic as a separate thing from a regular map, make them far more interesting so they are worth running.
You can add extra content in a different manner, for example:
Breachstone Tower - contains a breach that runs like a breach map from POE1 with a boss at the end.
Delirium Tower - area is % delirious. No timer. Delirium boss at the end.

And so on... I'm sure you could add many more interesting things to it that would fit into tower layouts.

Cheers!

The tablets should be placeable as soon as the tower is revealed on the map. The "reward" for completing a tower is just to increase the view distance.

Taking forever to set up the tablets venn diagram and only being able to do a couple of maps at maximum juice is not fun, makes 50% of maps tedious slogs to get to the towers