V-drive or direct drive?
Rob,
Is your A4 a direct or V-drive engine? The reason I ask the question is that most of the time cylinders #3 and 4 are the ones which tend to have valves stick. This is no doubt because of (in a direct drive motor) their closer proximity to the water inlet in the exhaust system. On the other hand in a V-drive version cylinders #1 and 2 are the nearest to the water inlet and might exhibit the stuck valve syndrome sooner. It certainly does sound like you are headed in the right direction with your troubleshooting.
Tom
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