Hey guys, my guild is going to start progressing on spine soon so i want to be ready with the max dps i can push because we aren't the best dps for that fight.So i have a few questions.

As DPSers we what we have is 2mages(1 with legendary) 1 Frost DK 1 Combat rogue(2nd stage daggers) 1 Balance 1 Ret 1 Blood tank and 1 Feral tank (The ret is tanking more but they want him to DPS and the Balance to tank for that fight, we both have legendaries as boomkins).

So my questions are:

Should i reforge everything to mastery now that it is nerfed ?
Should i stay 1 cast pre solar so i can put IS for NG (also should i not use dots 1 minute before the tendon) and then have another NG or go straight to solar?
This one i am almost sure but lets be 100% i have Insigia heroic + WoU normal i have to replace Insigia for bottle wish right ?
Should our balance stay as balance since he can probably pull about the same dps as the ret (if not even more, but then again ret probably has more burst) thing is our balance doesn't enjoy tanking at all.