Dark Side Battles Hard Node 9-B

Ummm, does anyone have any tips? I thought the light side hard battles were enough of a challenge, but nothing could prepare me for this battle. I've used all 7* characters with at least gear level IX, and I get smoked before I even get to Rey (and if I do get to Rey, my squad is half gone). My most recent attempt had every Resistance Trooper attack two to three times in a row EACH, wiping out my entire squad in the second phase before I could make a move. I've tried borrowing a Dooku ally for dodge, a Phasma lead for extra attacks with a stun lock team, an HK lead with droids for TM gain, nothing works. The TM gain for the Resistance Troopers is ridiculous, and couple that with the base damage of 17k a hit on non-tank characters, this level seems impossible. If anyone has any tips, I'd be delighted to know. I've managed to 3* every light side hard battle (including the dreaded Embo stage), but there seems no end in sight for this one.