Sure sounds like a sync issue...ignore the sync "meter" and try and match with just your ear...if it gets better and worse...then have someone shoot the engines with a photo tach or electronic tach...if still an issue, get it close then see if one engine is producing the vibes more than the other just by going down and feeling them. Start pulling props and anything else is a waste of time till you know if it IS a vibe issue and then whether it's one or both engine/drive trains
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