After trying several tactics what we manage to acomplish very well and in your case its very viable its that the two sentineles solo one warrior in each wave, and the other two dd with the tanks get the rest of the trandotians. You will need one healer taking care of the sentinels, and the other healer with the other group, thats with the right positioning should be very good. there are some videos using that same tactics (two sentinels/marauders handeling the warriors)

I "Loot" mines from GTN last week, and have been seen like 3 or 4 on the gtn since lauch.

Try Murks on imps side, he can craft those.