Oh ok. I haven't had that problems with the 20 series. I have had a problem with a truck but it seems to be the truck. I have tried different motors on it and same problem. It works on another truck.
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try an round iron core around each motor wire. sounds like you might be getting inductance bounce off your chassi and screwing up the phase posistion on your controller.
you can get the round iron cores from a radio supply shop
some cat 6 cables have them on them
and a alot of low level audio cables may have them
you can steal them off them
the reason why your shulze is not having this trouble is because its a better controller and they have acounted for this to happen
I am also looking into the xl, but would love to hear more. I have not gone brushless YET, but when i do, i'll have some money to play with....so i am a little info hungry!! thanks. It seems many go with 9920/9L, this seems like a dependable set up, but maybe would like a little more speed?
I would look at an XL motor. They will run more efficiently than an L motor, and if you want stupid power in the future they could push your truck well towards 60mph with higher cell counts.