Intrinsic

You can put a LOTG global recharge in Vengeance. I recommend re-thinking your defense strategy. I have a blaster with 45% range defense, and I have another blaster with 45% S/L/E defense. They are both plenty durable. You really don't need to go for both typed and positional defense since they don't stack, and dropping one would let you pick up other powers and diversify your set bonuses.

The taunt is a passive aura with a 10' radius. If I'm soloing an AV, for example, I can summon a drone before the fight out of range, and that drone will engage the AV outside of the 10' radius and last the entire duration. If I summon a drone during the fight while the AV is in melee range, the drone's taunt aura will pull aggro from the AV who will immediately two-shot the drone. Unfortunately Gun Drone has become least useful in situations where I would want it the most. Even with endurance reduction the power still costs a quarter of my endurance bar, so I can't afford to chain-summon these things only to have them blow up in a couple of seconds. And really, I don't want it to taunt. I just want it to do some halfway-decent single-target damage. Drop the taunt aura, or at least give us an option to disable it, and I think Gun Drone would be fine.