I just bought a Mossberg 835 Turkey Gun. When I tried to pattern it I ran out of adjustment while shooting 6" high @ 40 yards. I removed the factory sights and put on a TruGlo Gobble Dot front and rear. My question is this, since the TruGlo is not adjustable, would I be better off with the red front only or with the unadjustable set? I will also be using the gun for waterfowl and small game. Any help would be greatly appreciated, thanks!