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If you have verified there is no boost leak (to cause the boost to stay at 2 psi at 4k rpm, it would be a hole the size of your fist) and there isn't absurd back pressure (no rocks in your pipes), that leaves very little options.
Question, do you always use such low values for the WGDC on the GS? To maintain 25psi s/b somewhere in the neighborhood of 70 (after the spool style of choice). Yours slooooowly gets to ~50 (when you finally hit 18psi), I'm assuming you are giving it the beans for these logs (no TPS to verify). We can see via MAF it takes a while for your car to really start pulling in air.
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