What can I change? After aride for days I need to flex my hands backwards/stretch them etc. The palm are through to the inside of the fingers ‘nag’.

Im on low rise Haven bars, Raceface good n evil grips (I have largish hands). Quite a short cockpit.

holding on too tight ?
too much weight on the front end ?
or maybe just the fashion for ultra-stiff bars causing your problem
dare I ask if your fork is well-sorted ? 😉

You’re holding on too tight, used to be the same and actually gave myself a fair few hand issues riding the chatel bike park on a hardtail with what was probably an inadequate fork due to the death grip over the braking bumps.

Sounds like holding on too tight.. or

you need to change the frame 😉

Phew its the ol death-grip then. There was me thinking I might have to get carbon bars. No need!