First, yes kinetics is a great set, it takes many more levels then other sets to really get to the meat of what it can do, but its a fine set.
What I am asking is if Siphon speed were made into a AoE power, with no stacking of the buff on the hero/villain, just the debuff effect on targets in the AoE radius would that be overpowering or require a significant increase in the recharge or endurance cost or lowering of magnitude or duration of this power. It's not auto-hit like many debuff effects from say Dark, Rad, storm, or corruptor Cold. So I think it wouldn't be imbalancing. But with a change like this I think kinetics defenders/corruptors/controllers would be able to contribute alot more in teams in the early to mid game as they would have at least one siginifcant debuff to throw in fights.