FWIW, I regularly type without my pinkies (the left sees most use for Shift/Ctrl and some words with a/z) and can hit 110-140wpm for bursts, with 85-90wpm easil

FWIW, I regularly type without my pinkies (the left sees most use for Shift/Ctrl and some words with a/z) and can hit 110-140wpm for bursts, with 85-90wpm easily achievable for extended periods of time. I used to only be able to type about 55-60wpm in my high school typing class, but the thing that primarily sped me up over the years was learning piano. I'm sure practicing proper touch typing (or switching to Dvorak) would speed things up even further, but there's always the option of diversifying finger acrobatics into music.