Looks like TOM, W4BQF was right about switching to DVORAK for QRQ CW sending on a keyboard - 150 wpm typing example

[Chuck aa0hw]

TOM's article about his work with the DVORAK keyboard for QRQ CW TYPING

  https://www.eham.net/ehamforum/smf/index.php?topic=81139.10;wap2

HERE IS SOMEONE USING a DVORAK KEYBOARD to type 150 wpm