Recently got the k03 pro version with the billet jaws. In order to do fillet knives do I still need to get either the single fillet clamp TSPROF-CLAMP-CENTER-FILLET (older single clamp) or the whole-milled fillet clamp set ( 2 clamps) to do fillet knives? I read this allows for the thinner spine and also a shallower angle of 6.5 degrees with single clamp and 7.4 with the 2 billet clamps.