Without seeing you shoot it could be anything mate, your probably over complicating what you need to do at a guess, but again dont want to make suggestions without seeing you at work!
Missing last birds out then chances are you are tightening up. Relying on your skill has broke the first 3-4 pairs fine, dont try and force the issue at the end. You practice so you dont have to "try" and shoot.
Train hard, fight easy as they say in boxing.
That will be £50
Shot Windrush Sat, went to the last stand for a '93' and once again guffed it up, not a hard stand by any means?? tried the old mind thing but once again the wheels fell of and I felt like sticking pins in my eyes ., Clynt mentioned the words TOSSER . and said bad gun mount etc.... I recon you could be right with the tightening up thought and maybe thats why the bad gun mount, it didn’t feel like I was doing anything different sooo confused