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FixedCheese
Regal
The 4R36 movement is rated to -35/+45 seconds per day, so +17 seconds per day (or thereabouts) is well within spec. So Seiko won’t do anything with it under warranty.
A lot of them, in fact the majority I’d say, run significantly better than spec though. Most of the ones I’ve had are within +2 to +8. And you can give the rate regulator a tweak, if you want to get a caseback tool and try it. Or take it to a watchmaker and they can have a go. (Disclaimer: opening the watch may compromise the water resistance and invalidate a warranty claim due to water damage in the future.)
Something I recommend experimenting with is how you put the watch down overnight. Face up might even out the day rate better, or crown up might be the best. Leaving the watch in one fixed position is usually what causes the most deviation from the mean rate so it’s about finding the overnight position that “cancels out” the rate on the wrist.