My experience doesn't sound like your problem but FWIW....
I had a problem with flaking paint after completing an epoxy barrier coat. The epoxy had been allowed to completely cure before the bottom paint was applied. Interlux tech advisors said I'd have to sand off the failing bottom paint, then apply an additional "tack" coat of epoxy followed by the bottom paint while the epoxy was "thumbprint cured". Had to do this in four sections as the epoxy kicked fairly quickly. No issues since then.
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