Since I’m working on this now… It seems all the bass are played with harmonics, so I couldn’t really follow the thread properly.
Though I always wonder why Glinka chose to write identical phrases contain such minor differences. Eg. Bars 8, 16 of var II, bars 5, 7, 13, 15 of var IV etc. Wondering also if the b in bar 8 of Var III was meant to be played as harmonics. If so a harmonic notation is missing…