Wow, that is a seriously expensive build so far. Though you won't lose much by starting with Doctored Wounds and swapping into the more expensive sets as you get the influence.
That aside, drop Subdue and pick up TK Blast. It a far better set, it doesn't lock you into a shooting animation for as long, and an Immobilize is quite often unnecessary if you're going to fire through a teammate. If they're being healed, odds are that they're being hit in melee or by a Boss... Lts and Minions rarely do that much damage at range. At that point, an Immob is not as useful as a Knockback, to say nothing of the higher damage and faster animation.
Slot that and Will Domination up for damage, and you won't find your healing affected much, while doing far more damage. Heal other, Blast, Heal Other, Blast, etc... you barely lose any time on Heal Other, and you're no longer the dreaded "Heal-only Empath". Especially since those are two of the better blasts available to Defender, and it's a shame to not use them.
Another idea that I used (but I didn't mind aggro) was that if I'm not healing much, I'd throw out the AoEs, Scream and Psynado. They'll help your Recharge with Positron's, and help with damage on teams when the team doesn't need that much healing. As I said, if you have some other defensive characters on the team.. Tanks or Trollers... and you keep AB up on the Trollers, and Fort up on the Tank, they should do a very good job defending the team, and you would be a lot more free to blast freely. If that happens, you'll be happy to have some AoE attacks, and clearly your heals are already fully taken and slotted, so it's not like taking them would be making the healing aspect of the build weaker.
As a side note, if you really want to be a DEFENSIVE Healer, I find Dark Blast the best option. Between an AoE Immob, a -ToHit cone, and an AoE minion Stun, it really reduces incoming damage for the team. And the blasts are as quick as those of Psy Blast (though not as strong as TK Blast and Will Domination).