My experience of eliminating RSI:

1) Consider getting a big trackball and learning to use it with your wrong hand,

2) Get a better keyboard,

3) Work slower,

4) Walk as much as you can,

5) Lose weight,

6) Manage stress.

In common with many others, I believe there's an emotional and/or stress context to pain, and you need to fight conditions such as RSI on multiple fronts.