I'm the opposite. I used to use ergonomic keyboards, including a Kinesis keyboard many years ago. It never solved my RSI pain.
What did solve my RSI pain was simple: posture. The height of my desk/chair/keyboard/mouse/monitor were not in proper alignment. Once I properly adjusted all heights the pain went away in weeks. I also got a tenkeyless (Filco Majestouch 2) mechanical keyboard, which helped for its form factor.