Steve, it's been my experience that you can get a slower smoother idle with a three blade, but both my YSs will idle at 2,000 so that is not an issue here. The combination of a three blade with less pitch and the YS slow idle would give you some of the braking effect you are looking for. If your plane is already faster than you like, then the reduced pitch and very slight loss of effeciency of the three blade would be welcomed.