SR20DET w/ T25 not boosting

[Tom25666]

first off: s13 w/ redtop sr, stock t25/actuator, stock smic/bov, sr maf, aftermarket downpipe/ test pipe, walbro 255, ele fan, mostly stock (370cc injectors, no tune), no a/c, no boost gauge/controller

question: it feels like the turbo only spools half the time. or maybe it spools all the time but the boost gets lost along the way. there are no unusual noises (whistling) or smoke anywhere (blue or otherwise) that I can tell. I know the stock bov isn't a SSQV, but are you supposed to be able to hear it at all? Could the BOV be sticking open/closed sometimes? Maybe the actuator sticking? I haven't taken the turbo out to inspect, but I was thinking that if the turbo itself was bad it would be fairly obvious. Its been doing this since I had the SR swap, and I've done all the obvious stuff i.e. filters, belts, plugs. I'm running a Maxima clutch, feels like it is gripping just fine. WTF?