I installed some folding Noveske iron sites on my Noveske 5.56 and went to the range to site them in. I ended up having to crank the rear windage site almost all the way over to the right side to get on target. It looks kind of odd being that far over. Is this normal, or is there some other way that would leave the rear site more centered (like a shim between the rail and one side of the site?