The thing that helped the most and continued helping was not using regular computer mice. Instead I use thinkpad keyboards with a little red button for a mouse

The thing that helped the most and continued helping was not using regular computer mice. Instead I use thinkpad keyboards with a little red button for a mouse that's on the keyboard itself. This has essentialy got rid of RSI for me. Your mileage may vary, but the keyboard is like $40 so not an expensive experiment. As a matter of fact vi use 2 of those keyboards as they are pretty small and i have wide shoulders, also with 2 keyboards you can use the mouse with both hands, which also helps.