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@Bernhard
Maybe it's to do with the stiffness of the frame? Has this been covered?
If the frame is stiffer around the bb then less energy will be spent in bending the frame and more should go towards stopping the rear wheel. I believe track frames are built stiffer around the bb and with a shorter wheel base then there road conversion cousins, so there is less chance of flex in the frame meaning that a higher proportion of the force you put through the cranks should go to the wheel, this would only really apply when large forces are being transferred such as initiating a skid or doing a standing start. This could of course be toss but it seems to make sense to me. If you give your bb a push with your foot you can see how much it flex's and then compare it to a track frame/road conversion there should be more flex in a road frame I believe.