My guess would be that as the ATA gets shorter, it gets increasingly more difficult to get the dual cams to work in sync, depending on the design of the cams. I' d like to see a 36 to 40 inch VFT Dually myself. As the ATA goes longer, you can use a smaller cam for less mass weight and less limb tip travel for even less shock and vibration. I' d really like to see a 30 inch riser VFT bow with a 41 inch ATA and the new softened up Dually cams. 90 meter robinhoods would be [8D]!!!!