Twisted Wall Studs In Tub Surround
Looking at the picture it appears that the twisted studs are all shy of the front edge of the bottom plate.  If none of the studs are proud / protruding into the space, you could just add new studs/nailing edges as attachment points.  

I don't see the value of shiming the plates out 1" and adjusting things.  If the studs are protruding into the space, I'd just rip them back with a circ saw and again add some extra studs for nailing edges that are nice and flat.

You have some electrical so I'd probably go 2x4 on flat to avoid having to adjust the ele where the 14/2 is interfering.