Simply ask yourself these questions first, before I attempt to clarify why I mentioned it:-Are you going to take back your GOTSCHA ?
"who managed to screw up the wiring to both fields and halls?"
"Who was very sparse with information at first?"
"Who apparently did not understand what he was trying to do?"
The answer is that you did both, thats the "Gotschas" in this case.
May I in a friendly way, say that getting full information first, might have made the job far easier in retrospect!
What some people have done (including a very professional bike shop that I know), they have invested a tiny bit of money in an e-bike tester, like the one in this video.
The shop because it also allows testing of parts NOT yet installed in a bike, and its a rapid test for them, no fiddling with multi meters!
(Though I myself have not got my sticky fingers on one to test yet - sadly!)
Apparently, this shows the direction of rotation clearly for owners of such units, with the circle of LEDs, for motor field testing for example and other LEDs for testing all the Hall effect sensors.
Then at least you will know if one is defective or not, plus you get certain "rotation" information from both as well...
It uses only a cheap Alkaline 9 volt block battery, not the bike battery, which reduces the possibility of electrical dangers quite dramatically I should guess.
Whether you wish to pay for one or not is of course your final decision, I just wanted to make sure that you are fully aware of them, in a friendly fashion of course.
This time with no "GOTSCHA!"
I also hope that the problem is fully solved for you before this weekend's riding is completely gone!
Best wishes.
Andy