I have stupidly right forearms.Has anyone used an armaid or similar? Any other tips other than regular stretching?
Commit to regular & correct stretching. Look at your climbing style ie over gripping, and your work or other bobbies that may be contributing. No quick or gimmicky fix. You've likely got long term adaptive shortening. It will take a long time to correct.
Do you crimp a lot? Are you getting pumped out of your mind every session?
Stretch from your MCP joints, not pips or dips, ...
I went to the physio with a similar problem and he pointed out that stretching was much more effective after massaging the muscle. He gave the analogy that stretching an elastic band with a knot in the middle will only stretch the elastic (muscle) either side of the knot. Makes sense.