I have a Rad/Ice tanker that I've soloed GMs, frankly I was shocked that a tank could.
As you know because you've helped me multiple times past, but, I still don't have a dom at 50. I have multiples and the highest is 36.
I think you should try a Fort or a Crab, I like the Fort because its like a mule kicking ya with Psi. Crabs are unstoppable ranged/pet spewing ATs. Widow and Bane...meh.
Storm is awesome on any AT, I have multiple and Electric control is freaky fun.
I'm currently running a Grav/Storm troller as you know the Kaos King build and a EM/Bio broot.
Finding different sets that have a good synergy is always rewarding. I do have a Psi/Nrg broot that I got to 50 that I had great plans for that just was such a letdown (don't try it). Psi melee is a weird set, and KM is just such a joke. You know what add Fire melee to it too, Ice melee is so much superior.