ADC Kog'maw nerfs nerf AP Kog'maw harder than ADC Kog'maw

If you do the math, AP Kog'maw is losing 40 damage at level 6, and 30 damage at level 11, making it so that he has to wait even longer to even start dealing damage. He relies on base damages as AP Kog, and a loss of that much damage is equivalent to a loss of 133 ap at level 6 and 100 ap at level 11 (or 80 AD and 60 AD respectively).

I understand that ADC Kog'maw is actually very strong at the moment, but I don't believe his other playstyle should be nerfed, especially considering that that was his original playstyle. If anything, his q or w should be nerfed. If they must nerf his ultimate, why not nerf the AD scaling instead? Maybe even make it so it nearly doesn't scale with AD