was that my guide???
to explain yr set up. if you tapped yr hose into the intake manifold (as u should) yr gauge will read a vacuum while idling as the manifold holds a both a vacuum or boost depending on yr throttle position. now if tapped in before yr throttle body, thats a boost only source, and as such yr boost gauge would read all sorts of wonderful spacko figures as it would be reading a greater and 0 reading at all times (theoretically). This would give you a high point when idling ( as the air enters in intake pipe before the throttle body but doesnt escape through it) and a second high point when the throttle body is open and the boost is at full... what readings you'd get in between is anyones guess.
As for the boost yr getting. thats normal, remember that yr exhaust and intake will only vary your cars intake capacity, it will be easier to suck and to blow, but you havnt really changed the way the bov turb and waste gate function, so you wont see any great boost increase.
as above a 33gtst will boost to 5psi at low revs then up to 7 later... or the other way round i cant remember,