Sorry for the delay. The first thing is JR will analyze the cartridge to make sure it is within manufacturing specs. Next if you decide to just have the cartridge analyzed without your Kuzma headshell JR will make a special shim to go in between your cartridge and the head shell. Once you receive the cartridge back with all the data to go with it. You install the cartridge using the custom shim that JR manufactures for you to make sure your SRA, VTA, and Azimuth are spot on. If your Kuzma headshell is removable then you can send it in with your cartridge and he will do everything except set the VTF on your tonearm. Plus, once you do it this way you can swap the head shells with different cartridges setup by JR in a few minutes with no setup except VTF. Why spend $7,000-$22,000 on multiple arms. You swap out the headshell and you are playing with a whole different cartridge. If you call or email JR he will explain. You are missing the mids because the cartridge is probably not setup right to get the sound you want from your cartridge.