To carry the highest percentage of hits, you need a 15 pound ball, rolling at 16 mph, on the 17.5 board at a 4.5 degree angle to the 5 pin. 275-350 RPMS would be nice but not necessary.
Most people start on some board on the approach. Then from that position they find a target out on the lane where they think they can get the ball to recover from and carry. On a typical house shot that may work. On a sport pattern or something else flat like many tournament shots, the lanes will tell you where to play.
The first adjustment should be to your expectations. If you wander right or left, you may not be able to shoot a pattern that doesn't allow you to wander. Correct this weakness before your next Tourney.
Start where you know the ball must be to carry. Now visualize your ball's hook profile in reverse to get an idea of where you might stand. From there, adjust your starting position and speed until you get the desired result. If you can watch an earlier squad, find people similar to yourself. Watch what they do. Forget what you do at home. Go where the lanes tell you to go.