How's this team? JKA, Fives, Aayla, QGJ, STHan

Yeah, give that a try. Some squads may require that you rotate certain characters out. You may run into a squad where you drop Rey for a 2nd tank like ST Han. It just depends on the meta on your server. Keep a couple alternate characters on-hand if possible. You're main 4 characters being, JKA, QGJ, Fives, RG and then your 5th spot be filled by your alternates which could include Rey, Aayla, or ST Han (or another tank).