I think a little more tweaking the- cart alignment, anti skate, but tell us your findings..
Thanks Mike, that's great info, I do appreciate it.
on a related tangent(ial) I've just run track 2 of my trusty old test LP (Shure Audio Obstacle Course Era III) a few times and initially finding my Right channel running 0.5db hotter than the Left channel so there is a little bit of crosstalk in the channel balancing tests.. I've no idea whats causing that in the chain, whether its the cart alignment, anti skate, tonearm leads, phono preamp, MOTU interface, etc.. but i will have a further play around after I've swapped the phono cables around (I'm thinking if the imbalance swaps and Left becomes 0.5db louder than the Right then its something beyond the turntable and its leads and could be the preamp or the audio interface to the computer I guess.. I may never be able to fully balance L&R 100% but before I do another SQ or QS decode I'm going to have a bloody good try..!