I would assume if you send your Injectors out to get honed, cleaned and ballanced, they would replace wear items, and verify that your injector is indeed worthy of being worked on and sent back out for service. It eithor works or it doesn't, it meats the bar or doesn't. If 1 or 2 dont I would assume they have spares avaliable to sell so you still have enough. Just because it is new doesn't mean it works better. New stuff brakes all the time that is why there is a warentee, other wise people wouldn't buy it.
Im going through the same Q on a different motor OM352. . I can get new nozzles, but they also offered me an option of having them "new" nozzles honed. I think the idea is to verify that they are all the same and end up with a matched set, so in therory all 6 holes get the same amount of fuel. Thankfully the pricing is a little cheaper.
So back to your debate, I think sending your sticks out to get looked at and honed to your desired level of power is a good idea, save money and you know what you have at the end of the day. + you don't have to mess with taking anything apart, its pull Send out reinstall. Let the pros do what they do, and call it good.