5s help

[KJ]

I started a 5s team a couple days ago. We got to 2160 in two days our mmr was over 2.2k, then we went agaisnt the same team and lost a bunch of points, and now we cant seem to get them back. we just keep losing. When we do win, we only get like 5 points and when we lose we loose like 20. Now we have a mmr of 1900 and our team is at 1990. None of us have the tier 2 weapons, and it seems like all the teams we go agaisnt do have the tier 2 weapons. Any tips on strats on what we should do? Our comp is..
Sub Rogue
Ret Pally
Frost DK
Resto Druid
Disc Priest
Thanks for any help you can give us. We been having alot of troubles mainly with comps that have mages and locks on them.

[KJ]

Also wanted to add, our DK seems to get blown up fast, they always go for him. Any tips on that also?
Here is our team if anyone wants to check it out. Thanks again for the help.
You Die in the Smoke

[lumos]

Does he wear that pve trinket in 5's?

[GrandHeals]

He does wear the pve trinket, what trinket should we get him to switch to in your opinion?

[bkunzig]

He should be maxed out in resilience. If he survives, your comp. has outstanding burst potential. Wings&Zealotry in a smoke with PillarOfFrost&Use trinket means something is dead...even if he loses some mastery for resilience.

[Shoe]

That generally goes the same for anyone you find being focused, have them swap out some stats for more resil, since a small drop in damage is better than no damage when they're dead.