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Confirm that you ran the test with the throttles wide open.

Try pulling all the spark plugs, then rotation the engine while you take a look at the part of the valves you can see with a strong focused light. Check for damaged valves and pistons.

Was the plug color different on #3 or #2?
 

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Also:

Run the starter long enough to get 6 or 7 compression strokes on each cylinder. Note how the pressure builds. It should have a really good boost in the first couple compression cycles, then build slower to max.
 
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