Rich, I don't know how often you plan on tracking the car, where it's nice to be able to check tire pressures frequently, but if you're not too concerned, you might want to try a set of flush mount valve stems. I had the same problem and put a set on. They stick out about a 1/4" and don't leak. You do have to take the wheels off to access them though. Just a thought. It seems like it could potentially be much simpler than what you're currently going through to correct the issue. You wouldn't need the spacers or anything.
Matt
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