1 3/8 @ 50 = 2 3/4 @ 100, still a better group but only 3/4".
I'd try the crush ribs without swabbing at all.
My tests with JSG usually led to great groups one day and terrible the next. Seems like the higher the humidity the worse the groups for me. The ease of loading and easy cleanup makes JSG/APP a desirable alternative, but I've just never got consistant performance with it.