Our dps is 1 brd, 2 mnks, 1 smn. There is no need to make it half and half here. Our clean up strat at the end is the two monks or for you the drg and one bard kill the last rook, than the blm can lb the last set of adds while the drg and bards kill the wave 5 DK.
Mop up what the LB didn't kill and finish the last dread, make sure to top the mana off with mana song and you should be fine.

As for handling wave 2, kill the MT's knight with your 3 phys while the blm brings down his solider. When the first knight goes down get the drg and one bard to go to the other knight, the other two finish the solider.
If your dps is good you will break the OT's solider's Stoneskin by the time the Dread comes down.