Is it also an Issur Gamur for Bachur to stay in yeshiva for Shavuos?
What about a woman going to a Rebbe herself on a Shabbos or Rosh Chodesh?
You quoted one Tshuva, which was expressing a feeling rather than a Halacha, and you are trying to use that against many thousands of Yidden who travel, men only, to their Rebbes every Rosh Hashana. This is going on for hundreds of years, by many great and famous Rebbes and Poskim. If you have an issue with the fact that Reb Nachman is not alive, keep the argument to that, please.