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It's really nearly impossible to diagnose subtle engine noise from a video considering all cameras would pick up sound a little differently depending on the capabilities of the mic and and processing that gets done to the video. Your engine noise was more than subtle and was fairly obvious. Although even still there was a chance that it was more than a tensioner issue. Another possibility is that it is still a tensioner issue. That is, you made it go another notch on the tensioner but maybe it really needed a notch and a half to be properly tensioned. Of course the automatic tensioner doesn't have "half" notches. A manual tensioner is infinitely adjustable so if you are still hearing a little noise from the cam chain being a little too loose the manual tensioner would get that out. But I wouldn't worry about it if it is minor. It's better to be slightly loose than too tight.
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