Even though prot paladin DPS is terrible right now, you should be fine if you use SoT. I had major issues with a co-tank DK while equipped in a 'tanking profile' (tanking trinket + SoI). Granted he was doing things like casting DRW when not tanking the boss, but once I swapped to DPS, which you should be doing anyway with content being what it is, I could hold fine. At L100 damage should be close enough that there's never an issue in your guild. With that said it will be obnoxious to tank with randoms if I have to throttle because of their poor play or gear. Throttling is never enjoyable.