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The way that the cylinder pressure tapers off across three cylinders (110-100-90) but is still good on the 4th (120) would make me think that the cylinder head may have warped a little and the head gasket is suspect. If they were all within ten pounds of each other, and the variation was at random, I'd suspect it was just old age and other things but that taper...sounds like time to have a mechanic take a look, or do some more testing.
You might want to ask Don Moyers or someone with extensive A4 experience directly to confirm that, or how to check it out better.
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