I've been testing what you've said. Only some safe tests, I've tried the build you give me against sadur with full t4 DT, and some HMs with a full kithai DT and I have to say that the selfhealing and the agro are impressive. I have to say I was wrong. Now I'm sure a better player than me can do what you claim you do. I'm sure I'll keep using tali build on Unchaineds but for raids... I don't like it.
Imo fun raids happen when all the players "work" together. Appointing an star tank and push all the other soldiers into the background and make them play as a backups... It doesn't seems fun to me. I think while I can I'll stick to the old tanking way, and change the agro with the other soldiers. I think an agro beast is bad for dps players too. Playing a dps without the need to find the balance between max dps and agro it has to be boring.
See you around and thanks for the lesson.