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Originally posted by Greg Farrell:

By the way, is your BOV adjusted properly? You can check it by removing it and applying vacuum (18 mm Hg approx.) [CORRECTION: "in Hg"] to make sure it's not sticking between shifts. Alternatively, you can simply push on the piston to make sure it doesn't stick.

If you've been rolling along at any boost for some time, your BOV is likely closed, so if you punch the gas, you'd make boost. However, if your BOV sticks between shifts, it would take some time for the valve to close and for your boost to come back up.
You can also do a preliminary test of the BOV by placing your hand on it while you open the throttle quickly. You should feel a click as the piston slams down in the seat. Repeat this test a few times in rapid succession.

At idle there is vacuum keeping up the BOV piston. When you open the throttle, the vacuum goes away and the piston goes down. (And under boost there is pressure keeping the piston down.)

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I bet your actuator is good. I also suspect it's a 15 psi actuator instead of an 11 psi one.

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Did the wastegate flapper move easily when the actuator rod was disconnected?

2Gb