heres it ripped at 45: http://www.sendspace.com/file/bbzfc3
in fact listening to it now i definitely ripped it correctly the first time. i think you'll decide the 45 sounds worse. i'm thinking 33 is right. as in the original speed i ripped it in. where you got the nfg comparisons i dont know. and for more confirmation the impression on mustaine on track 2 is spot on on the 33. would be a bit weird if it sounded wrong.
cheeky question: do you have the vinyl yourself?
and the pics are taken on a camera phone which is why they're so shitty