yeah well, if you are equally skilled he'll have more shit by standard if left unchecked. Try to do drops, like 2-3 drops while pushing mint a main army towards him, you don't necessarily need to fight with that one, you just need to draw him out and make him split his army up with your drops
you only need tanks if he gets lurkers, until that it's basically a game of who has more shit. Widowmines are only good against zergling baneling. Get liberators as soon as he techs up to hive to counter ultras.