I found that polyairs an a std/lighter spring to have more ride hardening effect than if fitted to a heavier rated spring. Potentially as the 5 psi is still not having an effect on ride over the weight of the spring.
In my old mans D1 they need about 12psi before they start to take over from the effects of the swaybars. Tested with the swaybars disconnected (tested with the seat of the pants-o-meter)

