Interesting thread. I have the Blakey set on vinyl so I'll give it a spin during the week. Never noticed any particularly bad quality before though.
Fortuitously, I have pretty well all the LPs used in this set (except 'Pisces' and the two 'Jazz Corners') on mono NY USAs as well. I've always preferred these for soundstage/dynamics but if I get time I'll do a bit of cross-checking.