Actually, the spiral/flat idea occurred to me, which I discarded for the reason I mentioned. Even the difference between a 2/0 spiral and a flat of equal thickness will be noticeable. I learned this one from a puzzle I started (never actually finished), where I tried cutting the edge first with a different blade. The finish left was different.
As for suggesting such things, keep on it. People trying unorthodox things is the only way to grow and learn. I happen to have seen the effect myself on this one, as well as knowing how sharp the eyes of experienced puzzlers are.
One idea on mixing blades which just came to me is this: Cut assorted pieces, or even rows or sets of pieces with the spiral, not just the cross to halve the puzzle. The two kerf walls will still show a difference, and make the puzzle easier (this piece cannot go here, because the type of cut does not match), but the spiral cut will no longer dictate a place to put the piece.
Tor
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