Just a quick note: take Energize. It will solve your endurance problems. It's also a heal and a regen buff. It won't single handedly keep you alive, but it reduces downtime while soloing.
Some more things: Power Bolt and Power Blast really should be better enhanced. At bare minimum 5 slots. These are your bread and butter attacks and you'll be using them constantly. Power Push is worthless as an attack. Ditch Power Boost as well. While it does boost defensive powers, it only lasts 15 seconds and it's increasing knockback during this time. Speaking of KB, you're probably going to want a Knockback to Knockdown proc in Explosive Blast.
I've tried the Panacea proc and I don't think it's worth it. The heal is too infrequent and too small to be of much use and the endurance boost is made irrelevant by Energize.
Having Fly as your travel power is gonna be rough without Afterburner.
It looks like you've got roughly 20% Defense to everything. Typed and positional defenses don't stack, so I recommend picking one or the other. The magic number to shoot for is 45%.
You've got some recharge bonuses but not enough to make Hasten perma. You'll need roughly 105% +rech bonuses to make that possible.