I had a similar situation with my Panerai once where I bought one and it was running +10 sec per day, the store manager had it adjusted by its local watch maker (local panerai service center) and I could not believe how well they had regulated it! They made it to less then 3 sec per day but as it was a 3 day manual wind, they made it such that is was at zero deviation over 3 days (+3, 0, -3 on the 3rd day!). And that movement was really basic if you think about it. My point is with a good watch maker, am convince he should be able to regulated it to your standard! Good luck