Good job tracking the problem down, Dan. That damn Blaha hack works good sometimes and screws things up other times.
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and if you log it and have no knock, then play with the timing. It makes a hell of a difference!
I say, if you log it and have no knock, then turn up the boost. In my experience, it makes even more of a difference.

But my Ecu blesses me with about 27-28 degrees of advance at little to no knock at WOT anyway, so advancing my timing a few degrees manually doesn't do much for me. It may do more for a car thats not already seeing a lot of advance at WOT. A case of diminishing returns.