I like the concept but I would rather see an ACC buff than a DMG buff. With the AIM / BU combo my blaster was always near the cap regardless. If it comes down to fleeing or staying in the fight when my health bar gets red, I would rather know that I am not going to wiff.
I really doubt that a lot of players are going to regularly manage their health to keep in the difiance range. In fact most deaths occure so quick that we won't have much chance to decide one way or the other or even notice if we are doing more damage.