i managed to drag my knee for the first time in cartegena and once i had i managed to be able to do it all the time, both sides and on most corners
i had to hang off to do it
i found it helped me as when i got to the corner i could keep leaning and putting power on until my knee touched down and then i knew i was far enough
dont know if that is the general concensus of why but it certainly helped me in my limted way