I found an old "Adams" plow parts manual from the early '70's. Allis Chalmers had a couple plow models with offset hole near point, similar to the share on the Leinbach plow.
Not all Ford shares were 3 hole. 101's were, but Ford sold semi-mounted and larger CAT II plows (among others) that had 4 and 5 bolts.
Also, some Ford plows DID have offset holes. (Models 150, 151, 152, 154, which was actually built by Oliver) The link below will show several White, Oliver, MM, Ford , and David Brown plow shares with the offset bolt holes.
http://www.wieseindustries.com/lol164-plowshare_v_2671_-1,79,226.cfm
The pictures show your plow is NOT "just fine". As you apparently already realize, there should NOT be a gap between share and frog. And there is OBVIOUS wear on the leading edge of the share. 99 times in 100, that'll be the cause of a plow not wanting to "suck" into the ground.
Once you find out what share will fit your plow, look for a "rock share" or "deep suck share" to fit it. They'll have a little "nose" on the point that starts the share to digging in under tough soil conditions.