Vaheguru daas has a little input to add, I am a nina get singh in training and the reason I was told from a nihang baba was that we wear our Siri sahib that we carry daily with us on the right and as we see shasthar also as our guru, we also do park arms of our shasthar guru aswell as Guru Granth Sahib Ji maharaaj. So technically all amrithdharis should do parikarma from right to left. But at the end of the day the very most important thing is to sing Gurbani first most of all at amritvela bef