Average speaking speed for english speakers is 100-120 wpm for complex topic. I type 130wpm peak and I have the most common coding characters on my home row using neo layout.
It took quite some time to figure out what works and what triggers it. However I don’t know it’s the same for RSI.
I’m grateful for the ability to use speaking as a second option, but utilizing both I can’t cope that speaking is even remotely close to typing :/