
Its only 2 minutes long.

Cheers, I'm not sure what I can do about that. Removing my low pass didn't seem to make much difference. I'll have another go over the next few days.
Another idea: have you hunted around the frequency spectrum for any mids in the vocal that may be masking more of the clear, higher frequencies? Severe (6-12dB) but narrow-ish cuts, maybe 700-800Hz, or maybe somewhere around 1.1kHz, have been known to help other vocals. YMMV, as well as the specific frequencies you might need to cut.