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FBinNY, great points, and if hadn't thought of it that way. I do think a lot of it is based on muscle memory, so it makes sense that a crank of a length I'm not used to will feel weird. But of course, I could get used to it.
I'm just amazed at how I can perceive such small changes, if I'm not fooling myself. It ought to be possible to do blind comparisons, though it would be tedious.