Yeah there should be enough Eddy parts available to tune the bog out of the Eddy. Metering rods, jets, step up springs, there’s a lot of things to work with.
I know they don’t offer all the different step options for their metering rods that they used to, but there’s still ways to deal with that. Or track down an old strip kit if you’re sure you need one of the old metering rod dimensions.
Sounds like the tech doesn’t know how to do it, which is not the same as it not being possible.