When I wet sanded mine, I started with 1500 paper, maybe 1200 is too aggressive for your paint thickness. (I know you said that you applied 4 coats of clear)
I am NO professional, but here is my suggestion.
Wet sand the entire car with 1500 grit, then spray color on each of the areas that have burned through. Spray a few coats on each spot, and each coat should spread wider and wider, so the color will "blend" into the old paint. Then, spray several coats of clear over those areas.
Once cured, wet sand those areas with 1500, and hopefully the respray will not be seen. Then wet sand the entire car with 2000 and finally 3000. Then polish.
The car looks really good, keep it going.....
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