Most arm/cartridge combinations have two resonance frequencies, vertical and horizontal. Unipivot arms have three adding torsional. This is a seriously bad deal if you are a cartridge. The makers of the two best quasi unipivot arms, Graham and Basi, go to elaborate means to stop any torsional movement.
If you want to seriously upgrade your arm substitute VPI's Gimbal arm or install another manufacturers arm. You can mount any 9 - 10" arm on a Scout if you are clever. If it were my table I would mount a Kuzma 4 Point 9 on it. It is better than any VPI arm and a real value price wise. Other possibilities would be the Reed 2G, the Schroder CB and the TriPlanar.