Shoot every target as though the Grand championship is on the line. Always use the same intense focus you would during an ATA event.
One thing we've learned that really helps on the hard angles, when on post 1 & 5, hold on the opposite corner of the house during practice. You're swinging the gun a lot farther, but you learn that the birds aren't going to get away from you. When you go back to your normal hold position, the angles seem so slow (because you're moving the gun much less) that you crush them with ease.
Also be careful to whom you listen for advice. There are an awful lot of shooters willing to offer an opinion, especially when out practicing. I doubt they do it intentionally, but many of them are searching for answers themselves and can send you in the wrong direction in a hurry.