All you had to do for Kog'Maw-

Is give him back his AD ratio on his W and reduce the mana cost on his W, E, and R. Is that too much to ask?

If you have to take away his flat 2% max hp damage then that's fine. (Keep the 15 damage minimun buff though.)

Kog'Maw lacks what his identity is meant for. LATE GAME. Right now his late game is a joke and other carries do better late. As a matter of fact, old Kog'Maw has a better late game then the Kog we have now.