I think you don’t want to truly stick it you said yourself what to expect before you started and rule one if you can’t do it slow speed or force is not answer in knife throwing it’s how I got 38 stitches so you don’t have to. Second thing I learned never sharpen knife ask hospital when I cut myself on left foot one week and dropped knife from learning knife tricks a week later. lol
Light weight throwing knives are ideally thrown at a corrugated cardboard target. (Cut up an old cardboard box and glue up the layers with Elmer's white glue) Ideally from about 6'-7' feet, (from the tip of your extended hand to the target).and the technique is all from the elbow with a little spin imparted by the wrist. As to sharpened edges. If you have ever participated in a knife throwing competition at a Muzzle loaders rendezvous or similar event, those events require the blades have a full sharpened edge. They also require the knife has a proper handle. Cold steel makes a copy of Harry McEvoy's tru-bal bowie that is a phenomenal throwing knife. The only thing I would change is the handle material. If you are throwing multiple knives, blades are going to get hit. Replace the plastic with a hardwood scale or even better, get some leather, (about 1/4" thick and make replacement scales from that. I would also go with brass screws to hold the scales on.
You been at this for a long time. I just watched a 9 year old video on batoning with a knife. You were right. You should have pointed out the fact that are ancestors used froes to build shingles. Froes are large knives that cut through wood. Great work. Dave Canterbury replied in the comment section. The real Dave Canterbury!!!! LOL