When I was running through slowly it was a little easier but now I have high fcr and teleport I feel like I'm killing less and not noticing them. Any ways to increase their visibility? I mainly run chaos so clear most everything anyway but whenever I do a pits run or something I just don't see them easily and it slows me down a lot. Coming from D3 and even original D2 I feel like they were more visible.

Never had that problem. I mean even with 200% fcr sorc. They are always clumped together so that should be a sure giveaway. If you hunt boss packs exclusively I guess there is no other way than to slow down and thorough check.