Outhaul loads are similar, if not the same, whether the sail is loose footed or not... in fact the friction of a bolt rope foot can make the outhaul harder to move..
It does sound as if your range of adjustment is a bit low.. it's possible the sail was meant for another boat and it was a 'close fit' when someone bought it (probably second hand?) or if not the sailmaker should have paid attention and done it properly.
But as indicated above, even 3-4 inches of adjustment will be helpful and on a non racing boat perhaps totally adequate. In all likelihood your tackle is on the weak side and you may be pressed to get full extension there anyhow.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)