I haven't seen 1 big deadlifter without scars on their shins. It comes with the territory like the calouses on your hands or the black and blue marks on your traps from training calves.
satan, you mat want to try a sumo stance with your deads although many a great deadlifter had had long arms, longer the better really for this lift. The bar should scrape all the way up, are you saying it gets stuck on your knees?
The master deadlifter is Vince Anello, you may want to run it by him: