Running purgatory rear and anything over 25psi (like today) seems to bounce all over the place.

Is this normal for someone whos 12.5st (kitted)? Thinking my joe blow dial might be very wrong.

Trails and rocks are hard
Air expands in the hot sun
Rider grits his teeth

25 sounds about right to me for someone your weight.

run about 35-40psi myself. any less and i start pinching. also running a thicker tube..

I’m very slightly heavier and run 30psi on the back (tubeless) when it’s this dry – but the back end skitters around a lot when the riding is so fast and loose and dry.