Could Miss Fortunes Ult have better Ap scaling since It's base damage was lowered?

You are aware it now has 50/75/100% more waves in total and thus an AP Scaling of 240/280/320% instead of the old 160%? I think they factored that in.

I dunno, can it still crit?

i agree it should . the standard asap build is nashors tooth , rageblade runaans what ever boots you want sorce shoes or beserker greaves or cd boots if you want , lich bane and death cap. this build is more meant for people who have some sort of on hit ap like teemo varus kog so on and so forth but mf would be a ingtersting person