Not true; people with full blue heroic gear should be at least 13-15k. I'd look at active time (how many actions are they performing for the duration of the fight) and buff durations. I believe that your warlock should increase his uptime of Improved Soul Fire, but patch 4.1 may have changed things... However, I can speak for your hunter.
I'm a bit rusty, but MM hunters should be casting rapid fire twice every 3:30s. He should be popping it at least twice during careful aim phase (at the start, because all buffs stacked together increases dps exponentially). If he wants to increase his dps even further, just have him go survival and solo little add waves 1 and possibly 2. Additionally, it doesn't show him using Hawk or Fox at any time during the fight =(. There's probably more niche hunter tips, but I haven't played MM in a very long time for my 10m. I haven't really checked his gear either.
Additionally, have every raid member invest in buying pre-pots and actually using them. Additionally, no one should get any corrupted blood prior to phase. Yes, it's possible.
I'll attach one of our recent cho'gall 10N reports:
http://www.worldoflogs.com/reports/rt-hv8smuko39fh29ox/