I wouldn't set it at 500 tpd if 400 is the recommendation, unless it turns out that the watch was running slow when left in the winder for an extended period. I found that my Omega Chronograph had to have 600 tpd (1200 bi-directional) in order to maintain correct time. Depends on the watch. My Breitling does fine at 300 tpd. Each watch is different.
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