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amplitude sounds fine. just go to AD and get it adjusted. Wear the watch consistently for a week straight and calculate the deviation. Tell them that at AD and they will adjust it back to close to 0 spd. easy. they will stick it on a timegrapher, so they can tell you if anything is out of spec. Most likely, everything else you are worried about is not happening. 4 spd is still extremely accurate, but leaning toward the slow side. if it was fast, it would be easier to let it go.
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