I am a female and have a 4 5/8 span with 5/8 forward pitch in the thumb. I realize this is unusual, but it works well for me. At a seminar I took in Vegas just before the coaching summit, there was a discussion of pitches. I was used as an example of how charts don't always work.
About 5 years ago I started on the forward pitch. The coach I was working with slowly moved me to 1/4 forward.
Just over a year ago, after working with Ron Clifton, I moved to 1/2 forward. This year, after my annual session with Ron, I went to 5/8 forward.
Forward pitch will help you stay in the ball longer. I was dropping the ball before we went to the forward. Best of luck on your adventure with forward pitch