Just went to check for flat spots. The X travel was maybe a bit off, so I took the belt off, inspected and cleaned the V wheels, no issues I could identify. Retightened the wheels and it was much smoother after that, put the belt back on and tightened it all up. Unfortunately didn’t make any difference.
@WillAdams yeah hopefully early next wheel I have the tram tool and can get that sorted out, hopefully that’s it.
Also now I kind of want this for ultra accurate z-axis setting, http://www.edgetechnologyproducts.com/pro-touch-off-gage/