iowabow,
Personally, I don't use a wood pressure flaker. I do have a dogwood Ishi stick, but seldom use it, prefering antler. On the quartzite, and any really tough stone, you have to be very sparing with the pressure work or you end up with too thick of an edge, and really need to make a percussion pass to make the blade edge look right. That is where I think the little peg punches really come into play, although better yet is to not fool with the orginal percussion edge too much and "perfect the point to death" as I so love to do.
Most pure quartz actually is fairly easy to flake. It pressure flakes very well. What makes it hard is the unpredictability and frustration of all the internal cracks and such.
Keith