>>350625172
Cats plugin for blender has an auto atlas which is shit but fast for getting mat counts down. Anything that's going to use the same material settings can go on the same material. If you're getting to like a 4k texture then you should be doing it manually to get it lower. It always seems to be poly count for me that fucks me over the very poor limit, everything else is solidly in medium.
The ranking system is retarded though so try not to stress too much about it. Keeping out of very poor is a good goal though I'd recommend having a fancy version and an optimised version uploaded as two different avatars. Get the optimised version down to good or excellent and then just go nuts with cool features on the fancy one.