Ideally, a controller will make the rig seem to stop at the same rate, and with the same "feel" and the same brake pedal pressure, when the trailer is hitched up as when it is not. And it will do this at all speeds. Unfortunately, this is difficult to achieve, because disc brakes (in your car/truck) perform differently than drum brakes (in the TM). So your goal is to find the best compromise. All the hints up about "lockup at 25 mph" and "boost" and so forth are just intended to help you find that best adjustment point.
My choice - and it is strictly mine - is to find a setting where braking at high speed feels the same with the trailer as without. Braking at high speed is likely to be more important than braking at low speed, so I figure if it grabs or lurches a bit at low speed (and it does), I'll put up with it.
Bill
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