I think support too much juice from doing nothing. Too many support just sit and their money ball and upgrade all the turrets and Over heal them and when you go to take them out, Bam juice shotgun to the face. Which is one shot kill in nearly every circumstance. Even when your juiced. Which brings me to my point / suggestion. Support get more money from healing bots / turrets then they currently do but gain no juice from it, But they gain juice from healing players (more than they do currently). That way support need to be out in the fray just like everyone else to get juice. They can still camp in their base and build everything to max and hack it at their whim but they won't get juice from it so they can't 1 shot you while you juice to take out turrets.
It takes forever to get juice just healing stuff. You can only over heal things so much before you stop gaining anything from it, so I wouldnt be worried about the Support camping their base. I'd be worried about the guy camping YOUR base overhealing every pro/bot that goes in.
If the support is running around healing injured pros they get INSANE juice. Which given healing awards no assist points I dont so much mind about. Healing their own turret however, needs its juice reward reduced