ah well that rules that out<< have you bled it lately and do you have a water trap,,
even with my one fitted at the bodyshop I used to get the odd re-action, more so with white for some reason, fitted a wee filter at the gun also and that stopped all,,
http://i.ebayimg.com/t/Spray-Gun-Air...,PR-Q~~_35.JPG
its a pain in the ass,, just trying to rule out the obvious things,, most silicon re-actions I come across are from trim restorers and tyre shines etc on the pannel,, but the washing liquid, wet sanding and panel wipe that you've done normally get rid of it,,
read through what you've done again there with prep,, sounds perfectly ok,,
there's silicone in the fibreglass mould release agent from what i read on the internets
had the same issue on a mates car a couple months ago with new quarters - sprayed primer - fish eyes - wiped it off with thinner on a rag a few minutes later - panel wiped again - primed again fish eyes again - thinner on a rag again to take the primer off.. we then scotched the whole thing again dipping scotch into panel wipe - panel wiped normally again and it was grand then....
I'm surprised you're getting fish eyes in the paint but you didn't when you primed ?
Something must have come into contact with the primed surface - maybe you were touching the back of the panel with a rag you're wiping the painting surface with and there's silicones on it?