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.
".. 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)
1984 Fast/Nicholson 345 "FastForward"