I put a FF3 on a S&W 325 to do competition with, and am having a little trouble with the height adjustment. I've got it set as low as it will go, and it's still about 3" high at ten yards. The mounting plate is a Weigand "Weig-a-Tinny" and is flush to the topstrap. Anybody have any tips or tricks? I'm thinking maybe a shim under the mount, but there's probably something better that I haven't thought of.