sorry bud, but ud either have to keep adding coats of nattys or ud have to remove everything and start all over. ex-p along with other synthetic sealants dont bond quite right on top of carnubas.
a guy i know does tell me that he'll actually layer carnubas 3-4x's and then the day of a show will top it with a synthetic to add shine. he knows it wont bond but he does it for the finish.
once u put a carnuba on top, nothing other than a glaze or another carnuba will bond. but with sealants u can go forever!