Dan, I feel your pain but can't really offer a real solution. My understanding is that silicon is the worst fisheye creator, though any sort of oil contamination is right behind it. I've now painted three metal airplanes and never once had any fisheye problems. I used all the normal prep techniques but certainly nothing extrordinary. What you found on the blog sounds like good advice in terms of starting over with the paint. Just a few things to check...
-Could you have left your degreaser on too long?
-Do you have adequate filtration on your compressor lines?
-Could there have been any lubrication on the spray gun pivots that might have gotten into the product stream?

Not having worked with the Poly Fiber products yet I don't know how easily they come off, but I think wherever you have fisheye you're going to need to take it back down to probably the silver. Couldn't hurt to call Poly Fiber when you have a minute and get their advice too.

Hang in there,