I'm not sure how it a straighter pull will help my problem, but rest assured that I'm working on it anyway!
There were 2 discs I started using a lot when it cropped up, a brand new Ti Buzzz - love the way that thing flips a little before locking into its Buzzz line - and a Comet which I played a couple whole rounds throwing nothing but the Comet unless I was in putter range. Pretty sure it was the bead of the comet that caused a blister to form, and then a callous overtop.
I could see using ducttape if it comes to that, much better than bloody discs!
Putt and approach and shortrange: Wizards!
Mid range: Rocs, Comets Long range: Teebirds, Leonards
Distance: Vikings Utility: Firebirds, ???