I could probably get you a set of pistons custom made in 3 weeks. If not custom made maybe even quicker if it is a standard style of dome or combustion chamber configuration.
Another thought is that possibly Mike Panetta at Diamond could get you some together quickly.
I personally hate the JE pistons that they call nitrous pistons. Just a personal opinion. I also hate what looks to me like mountains sitting on top of a piston. I have been making mole hills out of mountains on pistons for a long long time. Even if someone does bring me an out of the box JE nitrous piston, I chop chop until I am happy.
Look at your burn pattern on your piston and in your combustion chamber. Look good at all the soot and crap. Now clean the piston good and wire brush the top hard with a brass brush. If you see any color where that color is , is your actualy burn pattern. I think you will discover that most of the previous colorations just washed off the piston, particuarily the piston dome and the quench pad of the piston will possibly look like it has never even seen any heat at all. If that is what you see or anything similar you can gain power with a different dome profile that works better with your chamber.
Wo cares if you lose a little compression if you are improving the flame probagation of the joining of the many different flame fronts to get a better burn. Actually I have done some pretty high compression stuff with domes that were not as larrge, particuarily with large swept volume engines.
You did have some very important measurements missing from your posts though. You never posted what the LSA was or what Intake Centerline you had it set up for. Even if you are degreeing in a cam using the .050 opening and closing numbers it is still advisable to check the Intake and the Exhaust centerlines.
Maybe your v/p clearance was enough, Maybe other guys would like an .0765 exhaust clearance. I don't.
Not to me it wasn't. I do not do exhausts less than .100 and I prefer .125. Intake is not so big of an issue and I do get them closer.
Ed