If you don't have a good pattern and it is hitting low get yourself a set of Tru-Glo open sights. Stay away form the magnetic ones get the ones that clamp on tightly with a plastic shim.
Also make sure you can set the back ramp for windage and elevation.

Start at 15 yards trying to blow out a quarter size dot. Adjust the windage and elevation until you do. I start with trap loads so ti don't bust up my shoulder.
You might even want to bench at this point - I do. Once I have the quarter size dot blown out I switch to my turkey load.

Also different turkey loads and different pellet size - i.e. 4, 5 or 6 shot act differently.

I use Winchester Supreme 4s.

Also you extra full chokes all do something different too. But the key to what you have will be going to a set of good open sights.

Now it will do one of two things. Bring your pattern in where you are aiming and forces you to keep your head down!

Hope this helps.

JW