Impossible to change air chamber volume and not spring rate…P=F/AThe Twinloc does just that for the rear shock, by reducing the positive air chamber volume. Although it only changes damping, not spring rate, on all compatible forks. I used to race a Genius 130mm travel bike. I think it would remain competitive in XC to this day...it just could have used a touch more anti-squat and a slight boost in rear-end stiffness. 130mm/90mm/Locked.
can‘t change basic scientific principles even tho some here would like too.