Nice review. And really nice rug.
I have dealt with some axe with the same wedge shape profile. when I first started with axes, I turned down about 3 vintage snow and nealley axes because I thought they were splitting mauls. It turns out, a lot of the Maine pattern axe heads have that shape to the bit. The problem with the fiskars I think would tend to be that it has the chisel grind you talked about. if you have a wedge with straight angles and you cut a bevel into it, its probably going to be real obtuse and not cut very well. the ones that I have I had to bring as close to a V as I could to make them cut well. if you get rid of the constant angle bevels (or near constant) and make the transition there go away, I think you will see a real improvement in chopping. Especially green wood, a lot of those Maine patterns I talked about were used to cut green pine/fir/spruce where the axe has a hard time pacing itself- It bites off more than it can chew if you will, and binds. A wedge shape axe doesn't bite as deep and as such both binds less and chops a good chip.
Edited to add some stuff about profiling*
