ah look what I found:
http://www.seymourduncan.com/forum/showthread.php?t=161502&highlight=p-rails+swap
Have you tried the A8 mag at all in anything? I don't know where you get the idea that an A8 is mushy. I think you may have lost your credibility for good now hahaha.
Anyway, the only thing you can do with the P-Rails in experiment. Kind of hard to predict what changing it to two powerful and different magnets will do to it's tone.
Anyway - I had a Custom in my LP for nearly a year and never liked it that much. I tried it with an A8 in it and it was like taking a blanket off of my amp. It was kind of like when Dorothy opens the door in the Wizard Of Oz - and suddenly everything is in Technicolor hahahah :laughing7: