Far as dps goes, you're biggest improvement will be tanks.
DK doing 18k on kill, should be doing ~25k, warr doing 19k should be doing ~25k.
If you match that, you'll be doing roughly 5 million more damage, in the same time window, which will ease healing quite a bit.

No idea how DK will do it, but tell you're warrior to aim for 78% ctc raid buffed (easiest is taking 2 dps trinkets, creche, essence, hor, eoum etc.)
He'll keep 100% uptime on SB for ctc and will also be doing alot higher Shield slams.
(Important you let the warr start tank, for rage, i personally pull with, golemblood, essence trinket and creche, soon as creche proc is over, i reck and call for cd, like pain supp/hand of sac / use enraged, im bursting 60-70k until cd's run out.)

Other then that, i tell everyone to get bigwigs and you'll get a lady counting down from 5 on fading light, press 'Hwill' when she says 1 and you'll safely avoid it with ~0,5second lost inside. (which is where dps usually struggle the most).