Arena Squad Advice

What's the better team (on defense)? I was using a STH led team, which was working for a while, but I've been dropping big time in the last couple of days. I know everyone hates evasion leads, but I'm tempted to switch back to prevent my rank loss.
Dooku (L), STH, Rey, RG (6*), Fives (Basic Omega'd)
or
STH (L), Rey, RG (6*), Fives (Basic Omega'd), QGJ (Basic Omega'd)
or
???
Other 7* in the wings: Lumi, Phasma, Barriss, IG-86, Ventress, Sid