I never put a boost control gauge in my VX so I couldn't tell ya. You SHOULD be managing 5psi though (given you have that pully). I highly doubt elevation is affecting you there in TX so that shouldn't be the issue.
Curious, what gauges are you all using? Mech/needle assembly or digital? My STi has a huge boost control gauge on my dash (OEM) that stares me in the face so I figure having one in the VX might not be such a big annoyance.