This is what Tag Heuer customer service pages state for accuracy tolerances:
Quartz movement: between -1 and +11 seconds per month
Standard automatic: between -5 and +20 seconds per day
Chronometer: between -4 and +6 seconds per day
So on that basis, you're within spec/tolerance. Hopefully they should be able to adjust and make it a bit more accurate, though - the movement should be capable of it.