I believe VTA setup with the IV is the same as with the 309, it's done by loosening a bolt and moving the arm up and down a column against friction with your fingers. It's not a fine adjustment, but it's easier than the Michell VTA adjuster.
The 309 is a very fine arm on the Gyro, and I'm sure the IV is also.
The 309 is a very fine arm on the Gyro, and I'm sure the IV is also.