You might try backing off the temp in you're curing oven, you might also try using a thermometer rather then what the dials says the temp is. It is very likely the top coat is blending with the base coat on a minuscule level, due to high heat putting the coating in an almost slurry like state, enabling the colors to blend a little, forming an off, or slightly different color. Another possibility is, some pigments are not as robust as others, and if by chance your cure heat is to high, our your cure time is too long you can simply be over curing them.
Best Regards,
Randy Gaines
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