We've only done T7 3 times, but I can easily solo it with my T6 A team:
Teebo (L), EE, QGJ, 5's and IG-86.
Also easily solo'd with Teebo (L), STH, QGJ, 5's and IG-86.
Teebo is g8. QGJ g11, 5's g8, STH g8, EE g8, 86 g8,
Proper Omegas on Teebo, EE and QGJ are vital.
You just have to time your assist calls right, and you won't see the Cap take more than a couple turns.
I do have pretty decent mods on them, with pretty good speed. Potency is decent, but not extreme.
Could to a ton of damage in T6 with my EE variation, just takes sooooooo long. I quit trying after my guild got to where we could finish T6 with one refresh and settled for doing quick damage against the Rancor.