id agree try a regular 15$ or whatever factory modified choke...

shoot some regular ole birdshot and see where it shoots.

one thing alot of shotgun shooters do it keep their head to high from the start and also raising their head before the shot because they know the recoil is coming and after shooting a couple loads of buckshot, the side of your face is hurting and making the problem worse many times...

try to keep your head low and get a good meld on the stock with your cheek..hard on shotguns because there usually is no cheek piece like rifles have...

if everything shoots high, your going to have to get adjustable sights or a scope to fix it probably...

if its a hunting shotgun, a simple rifle style fiber optic sight thats adjustable may work. if its a home defense shotgun, i like ghost rings. its like a large peep sight..or a red dot will work for either or a scope will work for predator/turkey hunting...