The state of Kog'Maw

So Kog'Maw at the moment is hovering around a 47.75% winrate in the ADC role and a .37% playrate in the ADC role (according to Champion.gg) in this patch and a 54.57% win rate and a .59% playrate inthe AP mid role. This is a bit concerning for a champion designed to be a bot lane marksman. One thing that has recently be placed on the PBE was a change reducing Kog'Maws E to a 50% from a 70% AP ratio while giving his W 3/4/5/6/7% HP damage instead of 2/3/4/5/6% HP damage. This is a bit of a Bizarre change in my eyes for two reasons. Riot has recently buffed two items which were or are core on Kog'Maw being Guinsoos Rageblade and Blade of the Ruined King both of which will be hitting live on 11/22/2016. Without seeing the effect these two item buffs have to Kog'Maw they are buffing his W while nerfing his E. The other reason I find this a bit off is Kog'Maw is seen to have a better time mid lane than bot lane and this change is making it clear that Riot does not want Kog'Maw to be a mid laner. Kog'Maw seems like a balance nightmare as his last rework was completely reverted (minus his ultimate changes) and due to the fact he is made to be an insane late game hypercarry however according to Champion.gg his winrate per game time is low until the 30-35 minute mark at a flat 50% however any time afterwards it drops down. This shows that Kog'Maw can't even be a proper late game hypercarry as his winrate actually begins to fall as the game drags on.

I personally love Kog'Maw due to his mixed damage and ult however I don't think Kog'Maw can be balanced with his current kit. I feel as if a full rework to Kog'Maw may be needed. What are your thoughts?