Power reserve

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I understand that my sea master 300m pro (2016) has power reserve of48 hours. After using a watch winder (850 tpd) and wearing, it lasted 52 hours from taking it off until putting it on again.

I have tried 750 tpd but this only gave about 40 hours.

Any ideas ?
 
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You're saying that 850 tpd resulted in the watch running longer than the stated power reserve. You consider this a problem?
 
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I don’t have 800 on my winder.

Worried about damage (re second reply)

Thanks
 
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850 is fine you can’t over wind a watch.