crimson iron nodes seem completely overtuned

within 2 seconds of spawning the node I get 10-15 blue+rare mobs that for some reason take 10x longer to kill than anything else on the map every single time. I can easily clear any other mining node in my maps right now. This was not the case for level 60-70 ones as I was leveling, but somewhere around 75 they became a straight up skip. Something seems really off with these mobs.