I sent mine out as well.. RC Fuel injection .. I had them back in around three-days but they are in Cali like me.. edit to say-- you're close too.. just noticed. They are in Torrance ..---- check them out though. A Print-out came back with it and explained what was going on.. if anything.. flow percentages of how they performed before and after.
One option is to purchase a ultra-sonic cleaner and clean them at home. You can get a cleaner from Harbor Freight for under $75. I don't know what a auto/diesel shop would charge but if it is a reoccurring issue it might be worth it. You can always find other uses for it as well. My injectors were stuck from setting for many years and I cleaned them myself in a ultra-sonic cleaner that I bought used. You will have to do a bit of research to find the right fluid to use as there are a lot of options and opinions.
A ultrasonic cleaner is great to have but the piece of mind of having them tested is usually worth sending them out. You can test them yourself, you'll be able to see the spray pattern but measuring the flow would take a little effort.