Thanks Emorrisiv. I have no doubt you can hear which polarity is correct with these LPs. My point was just that, given a fairly random distribution of labels, studios or locations, recording engineers, mastering labs, pressing plants etc., together with general indifference to maintainance of input-to-output polarity by these various entities, then "correct" choice of playback polarity should be expected to show a fairly random distribution as well.
The only reason I bring these things up, I suppose, is that I've ocassionally seen stuff over the years where some audiophiles promote running in "reverse phase" at all times, or with recordings of certain origin, as being some kind of panacea, which to me betrays a basic lack of understanding of the issue. (I recall an amplifier review in Stereophile once where the manufacturer advised the reviewer to reverse his speaker leads as a matter of course to get 'better' sound. The reviewer did, and agreed with the manufacturer. But this is an impossible outcome unless all recordings are made with the same polarity, which clearly they aren't. The reason for this, I suspect, is that sometimes we tend to hear any differences that result from our own hopeful actions as being improvements, when in reality what may be an improvement in some instances in others may be just a difference.)
It's cool you've also discovered MC loading too. We all know how this affects HF response (some like the extra 'air' of running unloaded, but personally I can't abide the accompanying mid-treble peakiness that damages natural timbre). However what I've also found, that you don't usually see so much about, is how loading affects image density and focus. Listen for this when you determine optimal loading, and then if you go back and compare the sound to running less loaded or unloaded, you might notice that your corporeal and located images have now become diffuse and lacking in substance and energy.
Anyway, getting back to the thread at hand, as the snow continues to come down:
Stackridge - "Pinafore Days" (Sire '74)
Pretty Things - "Parachute" (Rare Earth/Motown '70)
Puff - S/T (MGM '69)
Collins/Shepley Galaxy - "Time, Space And The Blues" (MTA Records, sometime shortly after the lunar landing to judge by the concept, jacket pix and song titles. Oliver Nelson-ish large band led by Duke Pearson sidemen Burt Collins and Joe Shepley both on trumpets and flugelhorns, with Bob Cranshaw and Mickey Roker rhythm section. Nice plush sound in a large acoustic courtesy Columbia's 30th street studio.)