It makes sense but it looks like you walk straight to the line.  It's hard to tell your body alignment but it looks pretty straight too, but when you get to the line your body is angled to the target while your slide foot is straight.  The crab walk you're talking about, I think I used to do that.  It's kind of like walking diagonal because the feet are at an angle while still trying to walk along a straight path parallel with the boards right?  I think angling everything towards the target while walking in that direction is better(for me).  Other wise, I'd rather do what you do, walk straight which seems to be what most people do(or drift left), but I still don't see how it can be consistent when you have to open up the same amount each time at the right time.