RE: sight suggestions
I bet you slightly lifted your head to peak! Turkey hunting today with the great variety of very tight choke tubes available for us - well you are really shooting a slug of lead shot at close range.
I suggest Tru Glo fiber optics that screw on or have wedge bar is used to secure them(not the magnetic type).
I also strongly suggest that you make sure they are adjustable for both windage and elevation so you can pattern your gun to a T and dial that puppy in.
The above is if you are young enough to see back sighting ramps. I used them for years with great success.
JW