I never learned to type formally and also use a limited amount of fingers. On my left hand I use my thumb+middle+index finger for everything except zaq and modifiers which I use my ring finger, and on my right hand I only use my middle and index finger for everything except for backspace/delete which I use my ring finger for. Still manage to hit 100WPM.

I was also stuck at like 50wpm and I knew it was because of using the wrong fingers for the wrong keys. Someone recommended typing.com's complete beginner lesson where they literally just walk you through which fingers to use with which keys and after completing that and 2 days of practise my speed jumped by 10wpm. Highly recommend.

> I type with only the three inner index fingers of each hand

You have a lot of index fingers. Most people only have one per hand. ;)

I had a similar beginning but using all the fingers, so I have to ask: was there something wrong with those manual typewriters, or did you just find manual typewriter keys in general hard to press?

> the three inner index fingers of each hand

Found the AI