I got a digital gauge to measure the VTF, I am pretty sure it's at least in the right ballpark. It still sounds good at 2.0, but for some classical recordings, the strings have some silbius or distortion, that are corrected by going to 4.0. I am still running it at around 2.2, but was curious why it is that way. By the way, I have messed around with the VTA as well, but the problem went away only after I set the VTF. Thanks!