Precision on a soprod movement

In december I received my Charlie Paris Concordia which has a soprod P024 which is announced for 0 to + 15s a day.

For the past 4 months it had a constant +5s per day. However, it's now been 10 days that it suddenly changed to a constant +1.5s per day.

As a precision freak I should be happy with it. However I'm wondering if it's getting more accurate, or if in a few months it might change to a constant +10s ?

Any experience on these things ?

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I have a Nivada grenchen super Antarctic which has a soprod P024 and that was running at about +15.

Movement has bedded in now (presumably coz mainspring has to coil and uncoil a few times to settle down) and now it’s at about +6spd. I wear it as part of a rotation though. Not every day.

I’ve had the watch for about 9 months now I think.

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I just posted about my new Super Antartic. +0spd for 7 days straight. I know this won't last but I have to admit it's fascinating to see this level of accuracy in a mechanical watch - even if briefly.

https://www.watchcrunch.com/radicaltiktik/posts/0s-lost-gained-in-7-days-nivada-grenchen-super-antarctic-3-6-9-tropical-33008