My soil has a lot of FE3O4 and I think that is why the Tejon is not as good as the V where I use it. I have a 10 turn GB pot on my V and I have no trouble balancing it, I could balance it with the 3 3/4 GB but it was "touchy" and more difficult to get right on. I have never run out of "range" on the GB on my V.