Energy Drain's issue is that without it, you're either 100% overhealing with your Aetherflow, or overwriting stacks, both of which feel bad. SGE gets around this slightly by tying it's MP economy to it. All we would need is for ED to be replaced by an equally spammable, but not damage related, skill. I'd go with a singletarget Shielding OGCD, that applies Galvanize (can't stack with Adlo), meaning it can be spread via Deploy for a fully OGCD Adlo-Deploy combo. Some would complain that 'well now I can't do more damage by being better than other people' though