Verus VX - French Horn Two-Piece Mouthpiece Underpart

I bought a Verse horn and I came across the issue where the mouthpieces that I used prior whether it was a Holton Farkas or a prodigy type mouthpiece. The horn would run sharp, so sharp my tuner was looking at a concert F sharp instead of an F when I was turning, but when I swapped over to this mouthpiece backboar as well as the H1 rim after a couple of days, all my problems were fixed and I love them both!