Swain Ult Healing Idea

Riot meddler I'm wondering why you guys didn't keep the healing of damage done on his r but added the healing effect karma has on her mantra w for increase healing done by missing health increased by ap, 100 ap for addiotion 1% or something around that instead. I feel like it'd be easier to balance around instead of flat health healing ? Or lets say we can give him an irelia passive effect to if hes nearby certain amount of champions his ult healing effect is increased by certain amount of % but only if its more then 2 enemy champs ? in turn you can gut his healing of minions so he can't heal off them and make him overbearing ? because as is right now he just builds tank and heals like crazy since its flat healing , if it scaled off completely ap and damage done he can't build super tanky anymore and be cancerous .