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Drawing my thumb across the blade has never told me anything when I do that. Well, eh, actually some "pling" and others don't. But apart from that, I really need to make small motions along the blade...

I believe I recognize your problem.
The skin on my thumb is rather rough, so unless I soak my thumb in warm water for 15 minutes or so, the TPT tells me nothing, if performed that way. Using the tip...