I think there is no difference between OS version I an II , except one of the belt has been enlarged from 9 to 11 mm
Regarding the brake, I followed OS / FUTABA recommendations and use 28 % with both RS 21 x 14 or Nurila 22 X 12 props.
ESC: OS OCA-1100HV
Acceleration: Lowest
Start power: Low
Advance timing: 0 degree
Air brake type: 15~25%
These are the exact settings I'm using for testing the AVERRUN SINGLE DRIVE