I had some time today so I drew an outline with a pen around a proven swimmer on paper. I then took two duds and individually traced each one over an outline of the good jig. I could now see what had to be reshaped (excess bumps, wrong hip, etc.). Fortunately, the jigs I have are roughly the same in shape (same mold?) so I could do this. I have another that is not from one of those molds, so no hope there. I transferred the offending areas to the jigs with a Sharpie pen and then slowly filed away. The outlines now match (hip points, subtle offsets, etc.). I also looked at the jigs' profile and noticed that there were areas that bulged up on the curved side of the jig near the tail. I filed these to match the "hero" jig. Most of the varying prob areas seemed to be from being ground wrong by a worker (dulled hip point, not enough ground off). As Ed mentioned, I think they have a standardized mold now so the variables are far less. I used a flat bastard file for the rough removal followed by a mill bastard file (love those names).

In the pics, the left jig is a good one I modeled. The pen marks show the areas I filed away on the center and right jigs (sides, convex tail area, nose, etc.). The right one was a clunker with excess outline and a thick tail hence the massive filing. The second pic shows outlines better. I tried them out and they now swim beautifully. Before they only rolled side to side. Here's a few pics:

Big Hammer Swimbaits-Hammerhead Jigheads
www.swimbait.com
Pro-Cure Scents
www.pro-cure.com

Attachment #1, (.jpg file)
Attachment #2, (.jpg file)