So you have creaters,not fisheye's. Fisheye comes from airborn or placed contaminates. Like boat said. OIL is a big one from the comp.
I believe you got crap in your air supply or thinner in the gun from cleaning.
Hook an adapter fitting in the hose coupler and blow it against some white c'board or such and SEE what comes out. Better filtering may be you savior here.
Other issue is cold temps and not enough flash time between coats.
Screw "recommended" in cold weather,best to do a touch test and go with it.
With laying that many coats of clear,I doubt seriously you had any metallic sticking up.Flake,maybe,metallic,nope.
I believe your original "fisheye's" were dirt specks or contamination.
BIG problem is,You used fisheye elim.
NOW, you HAVE to keep using it or it will never come out right.
I don't know who came up with this "snake oil" but they should have to repay every paint job it's screwed up.If your getting fisheye's,you better find out WHY instead of trying to "cover" them up with some crap product.