Well I used some of EA's F brushes in my Integy Atlas 19 motor this weekend in 19 touring. I held TQ for all 4 rounds and won the main. And let me say that it was a DARN good thing my motor was fast because my car was a PILE!!! LOL
It's a locked endbell 19 machine wound. I ran f brushes with a red/green spring. One drop of Tribo on the comm. The brushes had a vertical slot in them, but full width. The motor had a lot of torque so I geared it up to around a 31.5 - 32 rollout.
I also ran the F brushes in a reedy 19 quad mag Team Br00d motor in the 2nd and 3rd round. I ran a 30.5 - 31.0 rollout on the motor. I ran red spring on the positive and a green spring tweaked with slightly more tension in it. About a 7 and 6.5 and the fiddle stick. I made a 3/32" hole in the center of the brush but ran it full width. Also used Tribo on this motor as well. This motor was about a tenth slower than my atlas. I may have needed to gear up one more tooth with this motor, but ran out of time due to running 3 classes.
Just wish I had a car to match the speed. The car ran the same laptimes start to finish with no fade. Now if only EA would show me how to setup my TC3 I'd be set....