What has been selling, it seems, is the TK and Kepharts.
Most of what some of the other folks are selling are Bushcraft knives - maybe come up with your own style of bushcrafter -Mors Kochanski likes a 6-7" knife with a blade that has a long curve from the heel to the tip, saying that most of your bushcrafting work is done on the curving portion of the knife. Something like a Mora etc.
Most of the JK Knives you design have spear points with a symmetric profile and flat or convex grind, where most of the bushcrafters I have seen from other makers have a very pointy profile, with the belly coming up to meet the spine in a sharp point, and they are all scandinavian grind with no secondary bevel.
I don't know if that helps with making fuzz sticks etc, but I have been practicing fuzz sticks as a way to test knives and I have not been too successful. I can make shavings, but not curls. Don't know if that is the wood, me, the knives, or a combination.
I would not turn away from bushcrafter designs and mid-sized knives just because other makers are selling a lot of them, to me that is turning away from a large market. To get part of that market you have to make a knife or knives that appeal to the people buying them from the other makers.
I think you are taking great leaps with your new handle treatments. I believe that a lot of the people who are buying these knives are rarely every going get them out and actually use them in a camp or trail setting, but rather like shiny, pretty things and they buy on the impulse when they see the pictures of a knife.
I hope the XD Modern Bowie in a smaller size and thinner material does well, I am looking forward to the smaller one. I have been using the larger one around the property, and it is great, just what I wanted.
I think there are a certain number of people that like the more modern or tactical designs.
best
mqqn