If you want to fix the peeling clear correctly, the only way to do it correctly is to sand off All the clear and get to a good base for the new paint to adhear to. I would suggest using a straight razor blade to shave off the clear. Then use 120 grit to remove what is left. Then wet sand every panel w 400 if being primed or 600 if getting color then clear.

As for Macco, if they see you took the time to prep correcly , their paint job can be very good. I had a mason dump i preped and brought to them. All they had to do was mask the window openings(i removed all the windows,trim,grill, mirrors,EVERYTHING) They spayed the whole truck(dump body too), in non clearcoat,for $450. At the time the paint alone would of costed me double that. The truck turned out excelent. I seen the truck 5 years later and it still looked great. Maccos prep work sucks, but their paint work is very good. You have to figure, thats all the guy does all day, IS PAINT