+2

You have to keep playing with the shimming until all 3 phases are within 1-2° of each other... I like to start with getting the rotor as close to the sensor board without touching it, then slowly add shims to back it off until I get a good reading... it can be very time consuming, but the gain in efficiency is well worth the hassle!

Another thing I recently discovered is to check your timing ring (the steel ring where the screws fasten the sensor board to the end bell)... see if the stock ring is magnetic by pressing it next to the rotor... if so then replace it with an aluminum ring to further improve efficiency so no magnetic pull is effected by the timing ring I use thread lock and will be extra careful not to over tighten the screws because those aluminum rings are very easy to strip the threads.