Recently bought Ap 2 714 from American golf with 30 day trial. They said I was on the cusp of stiff even though the gizmo was recommending KBS shaft. I went with s300 as they said I could change them . Love the clubs but losing distance and they're hard to swing. Any advice before I go back ? How heavy are the s300? A mate said that with my swing speed(77) I should never have been allowed to leave with them!