That jives with what I'm seeing.
I popped the cover off of the VF3 at work just to see what it does and it is definitely not the same as mine. When sitting idle there is no air coming out of that port, and when it performs a tool change I can feel a quick burst of air.
On mine there is always some air leaking, but when I perform a tool change it does the big burst; it seems to me like the switch is working just not 100% right. I reset the small regulator to 12(ish) PSI, is there anything else that could be preventing the switch from working correctly or should I just bite the bullet and order a replacement?