-Don't random DF anyone. It is unlikely to win.
-In your shout, make it clear you kick/replace any players that consistently die and/or lag. Naturally, you should be very experienced, decently geared, and never die first to avoid mockery. Keep a 'blacklist' of players.
-2 heals and 2-3 DPS can easily live to titan 20%... Any healer that consistently dies and/or cannot heal in phase 5 should be replaced!
-Before starting attempts, go over things with your group. 100% understanding of mechanics is required for successful completion.
-During attempts, no one should type in party chat unless it is informative. Otherwise, they should shut up.
-The way my group won: Setup: DRG failDRG PLD MNK BRD BLM SCH WHM, no LB build, LB1'd the heart, 1 DRG dead at beginning of phase 5 to the end, DRG LB3'd for win. Basically, was a 7 man run.
-If you have any relic friends, invite them. I ended up winning without any relics.
Edit: I can't count.