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Richard,
the shank on every one of my Prana mouthpieces has a different thickness. My picc shank is much thicker than the rest. Dave does modify the inside of the backbore, scratching, scraping, whatever. It works though. Last time I was there he modified a mouthpiece for the picc on my avatar. I couldn't even "see" what he scraped off, but it sure did play MUCH differently.

I had the same intonation effect for the first week or so. I did not pull the leadpipe out and learned (forced myself) to relax. After that first week I only needed to pull the leadpipe out a little bit and everything lined up. Big improvement across the board. I believe Dave is right when he says that almost every trumpet player plays on the "high side".

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Whenever I feel blue, I start breathing again.