If you are having success freehanding, then you should certainly hone that skill. It will teach you much more about sharpening than trying to learn how to use a jig system. As was stated earlier, success with the lansky/dmt is proper set up and it is less commonly known that the wobble that the hole allows affects success. My results improved to near perfect bevels when I started placing my index finger over the rod holding it down and to one side of the guide hole. As someone described earlier, the stone and rod need to set flush on a flat surface and this should be consistent from stone to stone. Lastly, you need to clamp the knife in exactly the same place and I argue on the same side of the knife each time you use the clamp taking care to tighten the screw precisely the same(I tighten it completely). All of these results will show when you get to the ultrafine stone and you get a fine polish down and across the entire bevel plane. Executed correctly, you can get scary sharp edges.
With all that said, in my case, I can do all of these things and chop a hanging hair(sometimes), but I can't even get a nominally sharp edge freehand. If I were you, I would stick with the freehand method and be proud that you can do it.