Actually I’d go the other way. Keep the ability boost (and cost increase) but also reduce the energy cost/cooldown (change the Phoenix graviton to pickup 2 units 4 when upgraded…and get the cooldown reduction)
It is good. You don’t have to listen to others until you try it yourself.
You’re not playing Arty correctly. He’s great on DoN. Reavers with their 165 damage vs. structures would like a word.