Thanks for the responses! These are great places to start working from.
When I hit 22 I filled in everything with lvl 25 IO enhances. That was a huge power spike for the group. We are steam rolling content right now, we even upped the difficulty a bit.
To your second point, this is where I'm starting to feel a little lost. I haven't had issues holding aggro and keeping mobs off my team, I feel pretty much invincible, and my team is pretty sure that I do a a good portion of our damage. That said my primary powers have been getting most of the slot love so far, and I'm pretty sure I need to put more slots in my main damage powers.
I was unaware that Leadership stacked, but that's a great idea. Our defender is already in the Leadership pool, but I'll pick up some powers up and suggest it to our Sentinel too.
The Defender is Elec/Elec with Leadership. He's been a great healer and is giving us a ton of End and recharge. The Sentinel is Rad/Bio.
I hadn't heard that before, that's good to know. It would be cool to get some good procs into my build now instead of waiting till 50.
We've been doing TFs and I've already picked up my first piece of Might of the Tanker.