We are all different. First things first, have you checked the POI of your gun/load combination ??? You must be sure that the gun shoots straight, not right or left, you will also have an idea how high the gun shoots. I recommend shooting five shots at the same point of aim at 20 yards.
I also recommend you start experimenting with your hold points, what works for me might not work for you. When I started shooting in 1978 we were shooting the three hole targets. I couldn't hit a right angle from post one when holding over the left front corner, so I had to keep holding more and more to the right.(three hole were a slight right from one) Now I was holding over the center of the house on post one, this worked for me. I was holding a fairly level gun on one, two and three.
On post five I also had to come in from the right front corner as I too was having problems with the quarter angles. I figured that I would play the percentages and hold inside the front corner also. Most targets from five are not sharp right angles they are quarters and straightaways. I believe you should not try to trap a target, but instead line shoot them. I hold approx. 18 inches in and low ( approx. 12 inches over ) on four and five.
With these hold points in seven years from my first day of trapshooting I was able to become the 50th person in the ATA to get my grand slam. You must remember that these changes must be done slowly and by trial and error to see what works for you.
I would recommend also that you try your best to take a lesson from the MAN, Leo Harrison III. He can help you more than you can help yourself.