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Sounds very very similar to my issues, still haven't figured it out either.
Does your hesitation in higher rev's start around 4500-5k rpms? Found I had 3 cracks on the cylinder of #4 coil pack. Still haven't tested to see if it fixed my problem and my timing was a little too retarded according to my tuner, so make sure yours is correct.
Also, does your engine misfire at idle and if you rev to say 1500 rpms?
I'm still making building good boost, but for you check exhaust leaks.
Have you checked spark plug gap?
Been searching everywhere for a solution. Came up with TPS, CTS, knock sensor, bad mafs, coil packs, plugs, boost leaks and timing. Any of those variables could be causing these problems.
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