Dough,
SF has a progression much like TSO had. I suspect there are a few encounters you could do with the gear you have (presuming everyone is 90). There is also new shard stuff, though I have no idea how good it is (skipped it pretty much). I would guess right now you have a 100% chance at succeding in the first encounter in the Dragon Lair

without needing to farm somewhere else.
The raids I've been on, DPS seemed fine and Degu seems fine. There are not a lot of dual tanking things at the start of SF. Squishie survivability may be the biggest issue in SF - theres a ton of AOE damage. Alot of the mobs heal when someone dies. Getting folks crit mit (dont think T2 is going to cut it) and hit points probably a good thing. Getting off group healers healing equipment probably a good idea also. Last thing would be power issues, so that getting items to offset power problems would work also.
With that said, I am not sure you can get a lot of crit mit in instances in SF. And I have no idea how good the new shard armor is, but without the chance to grey out zones you cant farm shards like you could previously. So TSO stuff and the new encounters (When you can) are probably your best path forward.
I talked with Badsputen once (Ages ago) about this. He's fairly clever you know. Run the raids that give the most people a chance to upgrade stuff! That's one reason you push progression. Make it simple, and just watch the rolls on the raids you are running. If people are rolling alot then you're doing it right.