Well like all shooting advice you will get four different opinions from the four other shooters on a squad. When I give advice I tell everyone three basic things. Gun fit is very improtant. Do not dwell on a missed bird, shoot it and forget it. And last left handers are backwards.
If the gun does not fit you are not going to shoot it consistantly well, no matter what shells you use or even what chokes you have in the gun. Your full and full chokes makes you pattern into an effective .410 skeet pattern. 18-21" not 30++" that a skeet 12 pattern is as a rule. So unless you are dead eye dick with a .410 you are just going to have to learn to live with a few misses.
Second Skeet and Golf are the only two games, known to man, where you practice your misses and mistakes until you perfect them. Miss a bird, forget it, for Gods sake do not shoot ten more until you can not hit a bull in the ass with a spade. When you miss low 1 you need to get back to basics. Call, mount, track bird only a short way then shoot it by your normal method, swing through or sustained lead. Keep gun up until the bird breaks.
Third and final warning is that a right hand shooter can not help a left hand shooter and the same goes for the reverse. Right vs. left is a different hold point, foot position and sight pictures. The hard bird for left handers are not the same for right handers. Low 7 is a gift to a right hand shooter but no gift to a left hand shooter as it is a slight angle shot that often is missed to the side. So make sure that the person who is giving advise understands the question, the problem, the solution and can explain it to you.
Now for your free advise. First check point of impact for your gun at 16 yards, if within 4-6" of your hold point forget about it. Shoot one pattern from each barrel at 21 yards. See how large your pattern is or how small it is. If you have a pattern less than 15" you are never going to hit that many birds but those you hit will be impressive. Should it be 24" or more you have no real handicap and are just getting too old to shoot anymore. Enjoy your misses. Few can do that with style and flair.
Years ago my right sholder was so bad I learned how to shoot left handed. Then I mastered shooting form the hip from the left and right side. Now, on any given day, I can flinch form either side with the gun mounted or from the hip. An iumpressive thing to be able to do even, if I have to say so myself. I am a cross firing, flinching, middle age fart who on any given day can run a hundred or as few as one in a row. The drama keeps me coming back.