How about instead of buffing Cho'gath you fix his god awful hitboxes.

http://www.surrenderat20.net/2015/10/1016-pbe-update.html#more

Cho'Gath Feast (R) [Feast changes from yesterday seem to now be in-game] New Effect: Enemy Chamion kills with R give 2 stacks New Effect: If he kills an enemy unit with feast when he is already at max stacks feast will heal him instead - double heal for enemy champion

He needs to be fixed. Not buffed. Riot please do not buff him.