Good for you and your son.
Some advice:
When you forge the next one follow this basic procedure-
Forge the profile from the file/bar ( the silhouette shape of the knife), and forge in the distal taper ( decrease in thickness from tang to tip).
Forge the blank downward into a banana shape...like a kukri.
Forge the bevels in. As you forge them the blade will rise up and become straight. If it starts to go beyond straight ( like it did with your blade) , just curve it down again.
Once all is right, give it a going over in every direction to make it straight and flat.
Once the blade is done, normalize it, then grind/sand it smooth and do the HT.
The reason Mountain Man skinners are shaped like yours isn't because they work better...it is because the primitive smiths didn't know how to control the curvature while forging.
Stacy