Originally Posted by wowzerz
Is your bolt upside down?
this was my first thought, but if you are sure this isnt it then most likely the reg is turned up to high so you are way past your sweetspot and not alowing the valve to open up fully. thats why you have to counter act that by having the IVG turned all the way in. if you played with the reg and went all the way up and all the way down with the same results and no fluctuation
then the reg is malfunctioning and letting all the air dump directly from your tank