Dave, I took the handle of the Disston D-7 and held it up to my kerfing plane. My initial thoughts were, “gee, I sure made it big. I wonder if I made it too big.”
After reading what you just wrote above about your big mits, I am now thinking I did good by making the handle on my kerfing plane accommodating of the larger hand.
Will have to take pics of the two together.