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I think there are a lot of things that can cause mis-diagnosis.
Flooding carbs. - been there.
Incorrectly seated power valves.
Overtightened (cracked) power valve - had one of them too.
Badly seating needle valves - tell me about it.
If all of the above are right, then you can make a educated judgement on the rating of the power valves. If any of the above are present, then it will skew your judgement.
Mart.