Well since the first move of both melee is to hit you with 40 rip damage, my pristine clothes were instantly rendered nearly useless. Then they melee'd me for the damage I was complaining about. I literally had to cheat my stats to win.
To handle the Shredders the strat is to wait just outside their walking range, let them come to you, then focus fire one of them with both girls.
Alternatively you could also have one girl walk forward to tank and have Jewel pre-cast her healing ability on that tank to cause the lust damage that the shredders will hit them with to instead heal them. Then you can focus fire.
Shredders are weak to physical damage, so Jenna's pistols should mess them up pretty well.
> 2x Jenna attacks > Jewel lover's twirl > Jenna resets Jewel's twirl with encouragement > lover's twirl again