Might be a noob suggestion
But I think damage done with auto attacks should lower by a % per completed tank item.
Now here me out. There is not a single AP tank that does too much damage. They MUST build damage to do anything. But these bruisers walking around with nothing but full tank gear and still shredding nonglass champs is pissing me off.
Looking at you warwick.
We all know the big abusers are always these bruisers with a crazy amount of auto attack steroids. I think this is good balance. I don't want to fight 5k hp, 300 armor/magic dafense tanks with CRAZY HIGH damage and mobility. That is just stupid.
You want damage, build damage.