Ask for a "flow check" next time. They will check the flow rate, the IP and the inhalation effort and adjust things if they are in need of a little tweaking. It will also identify any potential problems such as a leaking high pressure seat. The charge for a flow check is about $10 to $15.
This is actually a pretty good thing to have done before a yearly dive trip to ensure things are working properly. This is even preferrable to an annual service as any adjustment problems or other issues following an annual service will occur in the first few dives and/or after a few weeks on the shelf or in the dive bag after the service. So if you have the annual service done just before a trip, any problems are likely to occur early in your trip - an inconvenient time at best. It's better to do the annual service well in advance of a trip and discover any problems on a local dive or during a normal predive regulator check a month or so after the annual service.
Then, after a yearly dive trip, and presumably before at least a few months of storage, get the annual service done as it will ensure the reg is fully cleaned and any moisture or salt that may have found it's way into the reg will be eliminated rather than sit in your reg all winter and cause corrosion.
The fact that many people follow this pattern may have been part of the problem if the tech was not aware the reg was recently purchased but was aware it was just returned from a trip as in that case an annual service would be pretty normal.
Of course, ideally when bringing a reg into the shop in person for "service" the customer will be assisted in filling out a service form where it will be specified exactly what is wanted in terms of the "service" and also whether the customer likes the way the reg is set up and whether they want it tuned the same way, lighter, heavier etc. This form is then used by the tech to record the reg's performance numbers before and after the service and to show how it performs and is set up after the service. And finally, the sheet gives the tech something to staple the bag of used parts to.
If your LDS is not using a service form, they should be. To be honest, I am still trying to get the LDS I work for to do this consistently rather than just taking regs from customers and leaving them on my bench with vauge sort of general guidelines about what they want done.