Personally, I'd like something akin to SCH's Energy drain for SGE.
My biggest pet-peeve with SGE right now is that you have to overheal with your addersgall or just stay at 3 stacks for a lot of fights.

The best solution for it would be to give it an ogcd that consume a single addersgall but on a CD (something like 60/90sec) so SGE doesn't end up in a situation like most greedy SCH who just use all their aetherflow in burst windows.