MARKL
Eats Squid
When I got my Reverb the instructions from SRAM said not to touch the air pressure...so I didn't and it still works perfectly. As a general rule unless there is a problem that a bleed doesn't fix I wouldn't touch the air valve at all.don't know the reverbs, but do you have to keep topping up the air to 250 psi regularly? check to see if the Schrader valve is seated correctly, mix up some dishwashing detergent and water and brush on to see if any bubbles are forming around the valve (air leak!).
if the air is not leaking out and remaining at 250 but feels spongy, sounds like you are compressing trapped air in the system, this will move and compress first before any hydraulic fluid moves