I got a Workhorse a little while ago. It was the first 3D printer I’ve owned that had auto-leveling, and something that I didn’t know is that if the bed deflects AT ALL when the nozzle touches down on the corner washers, then the levelling will be off. In my case it was always due to a dirty nozzle, despite the wipe-cycle.
I wait until the nozzle has heated for wiping, then quickly scrub the nozzle with maroon scotch-brite pads.
I’ve printed out the alternative wiper holder from this post: Improving Lulzbot FDM 3D Printers : 9 Steps (with Pictures) - Instructables, but I haven’t installed it yet.
I also spent a LOT of time trying to figure out why my print bed Z-height seemed fine on the left-hand side, but too far away on the right-hand side.
I eventually tracked my problem down to having different height bed supports (the squishy ones) on the left and right. Lulzbot sent me free replacements.
Along the way, I found comments saying that the bed-levelling won’t work if the min and max height of the levelling washers exceed a certain amount ( 0.5mm, maybe?).
This post helped me with printing out shims and adjusting things: SOLVED: Taz 6 auto leveling is >0.5mm off (NOW PERFECT TO 0.01mm!) - #5 by cmidgley