I think what you're not realizing is how big the Desirable nuts are compared to all the others pictured. What is somewhat misleading is that my Pawnee are a bit on the small side for that variety. I think I figured 64 nuts per lb whereas they are listed somewhere more like 55. Mine are a bit less than 1.5 inches long. Whereas the Desireable are closer to 2 inches long.
My soil isn't the best and I didn't water enough to max out size on Pawnee. I'm going to do better next yr and if I can't get the size up I'll probably remove the tree.
I just weighed well-dried, unsorted Desirable at 38 nuts per pound. That's 12 grams per nut compared to 12.7 for the sample pictured earlier. The big Desirable nuts run 14 grams or 32 nuts per lb.
My climate and soil aren't the best for growing big trees, large nuts, or big fruit. I see it all the time. My fruits are usually way bigger inside the greenhouse than outside. But a mature tree on strong root seems to do better. So my large Desirable tree probably has an advantage on the 11 yr old Pawnee.