Oh, so stupid of me, I hadn’t spotted I’d replied in the MacOS group, doh. So sorry… this is actually when using iPadOS on an iPad Pro (2020 12.9” model).
I have found the way to slow down the sliders on iPadOS, but it seems fiddly to use with a Pencil, and shouldn’t that be used for fine control, rather than a workaround?
Cheers.