Don't spend time looting, everyone needs to be moving as soon as the boss drops. Kill as few mobs as possible for trash. Use a paladin tank if possible. If you wipe, its basically over. Don't let those scouts get away, thats precious minutes if you are spending time killing more trash.

Be adamant about keeping a consistant 10 people going. My guild had issues with this because so many people wanted in on the runs for the loot, but with constantly switching people out we were also having issues getting bosses killed in time for chests. Got a solid 10, and within a couple weeks, 3-4 runs, we had the 4th chest down and our first bear mount.

At that point, you can start to sub people in, as of course, everyone's gear improves from going through Sunwell/BT.

Best of luck, I'm currently powering up on a new server, and hope to god I can find a guild that has 4th chest on farm to be able to get my bear mount before expansion.