Archer
··Omega Qualified WatchmakerCould the added torque during winding increase the amplitude so much that the balance knocks or overbanks (impulse jewel hitting escape lever from behind) momentarily? You could try to listen for it while winding (sudden 'galopping' sound).
I'm assuming you observe this consistently with an app that uses network time and corrects for network delay; I'm not familiar with watchtracker. Watchcheck seems to be ok, when I check it against the time.gov web page/applet.
Unlikely to be rebanking, as that would be sustained for a time if it was happening. This is likely a software issue with the tracking app that the OP is using. I believe the op's statement indicates this is not really a watch issue:
"This doesn't seem to affect its +5 SPD average. I'm just wondering if a time gain from winding is normal - seems odd to me."
So the answer is there really is no gain from winding in this case.
It's not the best place to ask technical questions.
