To the previous points, DPS and Survivability will increase as we get more familiar with the fights...moreso than with gear upgrades is my guess (for normal mode). We did very well last week considering it was the first time we have been seeing some of this content and it will get better.
In the same breath, please do not continue to take fireball after fireball (Razor fight) in the face before moving. Those are PROXIMITY attacks a.k.a if he targets you, move...if he hits you, move...which makes me think clumping up is a better strategy (to better disperse the attacks), but as long as she dies, its fine with me.
And do not underestimate the importance of the 10 man runs. Many of us are in 10 man Ulduar and the fights are very similar, if not exact. If you don't have a 10 man, you may want to to think about getting in one (time permitting of course). As far as gear, there are BIS items for me personally that I only get out of 10 man, not 25 man.
K