You would have to up the shop item and rank prices AAA LOOOOOOOOOOOOOOTTTTTTTTT
Also, while this may sound cold, part of the beauty of AoD was how cruel it was. You got some really good damage on a guy but still got killed? Nope, no brains for you. You spent a ton of time totally outclassing a juggernaut or landed tons of hits on runners? No kill, no reward. And the killsteals. THE KILLSTEALS. They were annoying as FUCK... but it was fun. All of it was cruel but fun. I don't think we should get rid of that. Plus, in all honesty, giving brains for partial health damage kinda feels childish :/
*not staff anymore so this is just my personal opinion*