I agree with Mike, too much powder, my 20 gage likes 65 grains of 3f with a spit patched ball.
Start with about 60 grains and shoot 3 shot groups. Change by 5 grains and shoot 3 shots again. Is the pattern tighter? Raise it by 5 grains again and shoot 3 shots. Keep doing this until your group starts to open up again. When you have your tightest group, that is the load you want to use. In my opinion the wads are not needed, but your gun will tell you that. Experiment using wads or not the same way, shoot 3 shot group and look at the pattern. Make one change at a time and check your pattern, don't change powder load and wads at the same time.
Once you have your best load then you need to practice on your sight picture. Pick an anchor point on your cheek and be consistant. If you are too high or low, you need to adjust your anchor point up or down to correspond. The real key is consistancy once you find what works.
Shooting a smoothbore is not a science, there is no magic formula, it more art, you have to find what works with each gun. Good luck, keep practising, and have fun. Once you get it right you will love the smoothie and wonder why anyone would ever want to shoot one of those guns with those danged deep gouges ruining the inside of a perfectly good barrel. :rotf: