The only thing I worry about about switching Sch to OT and Whm to MT, I think the sch might have more skill.
As a example: In Turn1 the other Pld normally the OT with start on Cad(Sch), While I pop slimes before split and then grab it when it dose so. Seems there's a 1/3chance I will die @3-4stacks while cycling CD's(Whm). T2 Sch heals tanks and whm dose others and throws some heals to assist sch if needed, we have no healing issue's here.

We have discussed Pox from rooks a couple times. I'm not sure if that's why he is going down so fast, it's possible tho.

Actually I haven't even noticed if the brd is doing foe for the dread on p3. I think people are avoiding food since so many attempts just leading to wipes.

Are idea was to finish dread, then have OT hold spiders+1rook, while MT holds the other rook and mnk assits MT>OT. While Blm+Brd+Smn try to aoe everything.
Would it be better to just single target focus the rooks and possibly 1spider, then feed remaining spiders to the dread?
My health is bouncing all over the place on the 1st dread. I'm really worried if I'll be able to be kept up when there's 2.

Thanks for all the comments so far.