Regarding racers in exile - that sounds incredibly dodgy! Legally they can't take money until it is in stock ready to despatch - if you paid by visa I'd contact them ASAP! On top of not replying to messages, he always used to be on here but hasn't been since before Xmas.
Regarding the sensorless issue, I personally think the 930 software is far more sensitive to sensor issues, I ran the 211 software for 5 months with no issues, the 930 I had 2 esc's with 3 motors have the same issue - plus I had no brakes!