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I use to do Dynamic balances with an Aces 2020 Probalancer.
There can be several factors. First, the person doing the balance may not be doing it correctly.
Second, what is the TT of your engines, time (years) since overhaul and were the engine mounts changed?
Faulty engine mounts, worn out magnetos will cause problems, as will a faulty ignition harness. Also, did the person doing the balance check the prop track?
So will loose and misaligned control surfaces and gear doors. Go up and at cruise without changing power settings dive and climb and see if the vibration changes.
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