I heal most of the time. I also played a marauder in the past. I do not agree that there is a Hybrid Tax, Dps is balanced for the most part. Concealment Operatives / Assassins will get the short end of the stick simply due to PvP Balance and Powertechs might be a little undertuned.
Marauder DPS is ok, Bloodthirst is ok, being able to bring multiple marauders for multiple BT's is NOT ok. Unless you have done actual Progression Raiding, where everyone is in the best gear and you can't youtube strategy videos, you are out of your element here. More Marauders is a real strategy that has been used to success in the past.
When you have more than enough skill players to fill your raid, you pick based on class. Marauders have an unfair advantage here. If BT did not stack each additional Marauder would be no more effective than any other dps. As it is now not only are marauders very good dps, they make everyone better.