Yes, that new book "The CW Way of Life" mentions that: Once you know how, sending good code at 10 WPM is more challenging than at 20 WPM; by 10 WPM, the oscillations are so slow you have to measure them rather than just letting the arm vibrate like a spring." The author speaks of "tones" or vibrations, like the German "Gestalt", patterns that fuse together and become one unified recognizable pattern. When you slow down you have to count the rhythm yourself instead of using the brain's automatic Morse flywheel the author calls "the dit train" which is part of both sending and receiving.

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DR