Were all of those saddles causing you pain and blisters?????

If so, I know this is not the question, but:

what about a professional bike fit?

if there is a massage therapist or PT that knows anything about structural alignment in your area, why not check if your pelvis is aligned properly?

Maybe you're not weight bearing evenly on the saddle (you would not necessarily notice) or you're not optimally fitted...

Have you measured your sitbones?

Even if a saddle is not GREAT, or even somewhat painful, I find blisters to be a bit much... I would look at other factors, not just the saddle...

Good luck. What an annoying problem to have!!