I think you are very close to getting this working!
Before you check your soldering, howabout you try an open loop test. @Antun_Skuric has provided code here:
https://community.simplefoc.com/t/cant-get-good-data-from-sensor-cant-turn-the-motor/57/22?u=owen_williams
Update: pole pairs is quite similar to the above code, it may behave the same!