That would be abusable by the headless chickens who give up early, or bots/alts throwing matches.
Killing was never a problem or a reward, personal objectives don't do well in a team mode.
edit: I agree soaring needs to be changed. Focused killing need to be rewarded, random/aoe kills no.
Instead of damage buff by percent, why not give vulnerability debuffs to targets.
Amount of soaring stacks sets how many targets we can put those debuffs on.
