I'm just curious. What were the dates of the performances with bad sound? Also, where were you seated?
I saw A Strange Loop on Fri., May 20. My seat was A 1, which was an aisle seat in the second row Orchestra, House left. Despite the fairly high stage, I was able to see the actors in full, although I had to look up. I had no problem with the sound. I heard every lyric without any problem.