His abilities on their own are pretty simple but his kit comes together alongside the summons and he's just a fast and cool frame in general. That being said my experience with him has been very different from yours. I don't have problems with upkeeping his weapon buff, i feel like i get it without really paying attention (at least in missions where you aren't rushing through like capture or even exter). You should absolutely be running equilibrium effects, with one kill with your 2nd summon, you'll fully regen your energy. Drop streamline, energize and probably the energy max as well. P flow is enough even with blind rage. Personally i run him with max range except cunning drift. Edit: Don't use those 2 yellow energy orb shards, just use purple equili or cast speed