I seriously question the need to scrape after a hot wax. Not the drip a crap load of wax on hot wax(I only drip on the proper wax if I do it for a base cleaning) but the rub the wax on like it is a crayon. My process is:
Wipe off base
Touch wax briefly to Iron
Rub Wax on Base
Iron wax on base
Nylon Brush base.
My understanding is the lines brushing from tip to tail creates tiny channels, like a tire, to let the water escape the underside of the board.
I have not noticed any difference in board speed. Neither has anyone else I've waxed a board multiple times for this year. And to me this makes perfect sense. If you are riding on your edges, the wax on the rest of the base is not in the equation. Plus, the only time I notice the wax being gone, is along the edges. If you are riding the board pretty flat, your not riding for speed.
What I have noticed is that the boards need a hot wax less often.
Wax paste. I like it post ride to get something on the board if the wax is obviously gone. This gives me time to get to the next hot wax.