First, what's the theory behind choosing a drag brake setting? I'm sure this varies some with driving styles and preferences. Now that I'm running brushless it doesn't seem to have the same drag brake or cogging the brushed motors do. That's adding some more confusion. Some of the fast guys at the local track seem to suggest running little to no drag brake. How much weight should transfer if any to the front under neutral throttle or should it just coast?
Much of the reason for running drag brakes is consistency. You can setup drag braking in a car for consistent roll through a corner since you just have to apply throttle to keep your speed up, or slightly let off to slow the car down; if it's simply up to you to brake going into the corner unless you've got one heck of a finger you won't always use the same amount of braking in the same corner time after time, where as if you have your drag brake setup correctly for the course all that is required is letting off the throttle.
It all depends on the car, setup, and the track. When racing stock rubber I have no brakes, no drag brake and I rarely lift the throttle. In 19T foam I use just a touch of drag brake (maybe 10% if that) to slow the car and aid in rotation, and add a little weight transfer to the front for steering.