Great experience indeed. Nice Job.
What tinders worked best (or even at all) with sparks struck from the flint/knife combo? I've never been able to get that work with anything other than char cloth.

-Blast
I assuming that you mean something naturally occurring? Now I don't feel so bad. I haven't had much success with naturally available materials either.
I am thinking Milkweed pod silk or Cattail fluff (the plant that is) might be an option, but haven't tried yet.