My n/s/r looks a little low and pulls to the left, i actually think my crossover valve is suspect, although i would have expecred it to throw a fault.
When i got it 9 months ago it felt very stable, but within a few days the n/s/r felt sloppy, but would sort itself if you violently shook steering.. I have sort of got used to it as it goes up and down ok. If valve is culprit then o/s/r will interact with n/s/r, which should only occur on highest setting... at up to 12mph, so unsure here, no doubt it will be something else rather than my feeble diagnostic skills. I too maty try a re-calibration.
Good luck and keep us all posted. SaintV8 is worth listening to btw.