@Cpt_Dan
Who do you have? Because you really don't need a tank if you have two healers or one healer and two pseudo-healers.
Each member of my squad can heal someone in some way, so I do fairly well. Currently ranked 228 in a server up to level 60.
For example in my last PVP Asajj was dead, Ahsoka was in the red, Talia and Daka were in the yellow.
So Daka used her heal and revived Asajj, then Luminara healed and all of a sudden were all up to 90% - 100% health.
I probably would have won anyway as it was 4 vs 3, but that is just one example of using two moves which can completely change the outcome of a match.
In my opinion, using a Tank will only hold you back.