I still find that trollers and fenders are important. They are no longer squishy and dependent on teams for survival, but they add to mishs on many levels.
I was amazed that my ill/emp actually soloed her iTrial mish with the Captain and Honoree. (even my tanks didn't do as well) She confused the Riktis and the Captain till all the Riktis were dead and Honoree turned blue, then sent her phantoms in to finish off the captain. After that experience, I have helped many friends with it. (Way more fun than dying over and over LOL)
I am not a stats person, and my builds are trial and error. I Just play for fun and learn as I go.