On Kabbalah and its customs

The rabbi wrote in his reply that he sometimes accepts Kabbalistic principles, but in his opinion there is no need to fear Kabbalistic customs that have not been incorporated into the halakha. My question is: A. Is it possible to object to a Kabbalistic principle that the rabbi does accept and sees as correct and true? on. Do principles that the rabbi accepts also apply to customs that are related to this principle and that the rabbi practices? Can I please also look for such a custom, if there is one? third. Is the rabbi obligated to customs that stem from principles that he does not accept and that have entered into halakhic law (following a ruling that he apparently accepted them…) and if the rabbi does practice them, is it from the Torah a custom and then, ostensibly, can it be permitted as a custom?
Thank you in advance for your valuable time.