With clamping sharpening systems there is always a limit to how low an angle you can get because the jaws get in the way of the stones hitting the cutting edge. If you have small blades that are common on many traditional folders you've run into this problem. KME's Pen knife jaws extend the range of sharpening allowing you to get lower angles on your small blades. And they are easy to exchange with the original jaws.
Victorinox SD Classic Blade: 1-5/16” long x .228” wide Grind: Full flat Actual Sharpening Angle: 17 Degrees