That's a serious amount of bass, maybe too much judging by the way my letter box is resonating. The vocal track has a lot treatment which on a bare track like this, allows the unwanted sounds to come forwards. Especially where the vocal stops before the end of the section you have posted and then the noise vanishes, which might be better done at all the positions where no vocal is audible. Quite envious of your vocal range though, I'm blessed with something that sits about an octave lower lol. The breathy noises would be ok if they were natural sounding, but they are not, due to processing of the vocal. Again, while I'm now listening on cans in the name of letterbox preservation I'm suspecting some mild break up on the peaks, but that might just be my sound card raising its white flag.
all the best
Tim