I have to admit that I think that "you increase the angle of attack of the downward moving blade, thereby increasing lift/thrust and producing a yawing moment" (p-factor, or asymmetric blade effect) is a red herring.
The effect is very well known to tail-dragger pilots, because it does interesting things during the take-off run. (It is very much present at the start of the run, goes away when you lift the tail, and then come back again when you rotate.)
However, the effect which a tail-dragger pilot experiences on take-off is with maximum power. And, in a low-powered aircraft - something like a PA18 with a 150hp engine, not all that different to a typical spam-can - the effect is barely noticeable. So I find it very difficult to believe it could be noticeable to any real extent in the landing flare, at idle power.
Having said that, I don't have any other suggestions!
FFF
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