I hear you on the weird channel on Jimi's vocals. I have experienced this on many LPs of the 60s and 70s. I'm able to kind of tune it out when the music being played is superior.
Great day off of spinning vinyl:
Pat Travers - Black Pearl
Reece Wynans and Friends - Sweet Release (great music and great sound)
Mazzy Star - So Tonight That I Might See
The Montgomery Brothers - Groove Yard
The Dave Bailey Sextet - One Foot in the Gutter