I have just bought a new full set of steel irons AP1 4-w2. It has been a month that i have been trying to get familiar with them and I already noticed that with the 9 iron i have serious difficulty in lifting the ball up in the air. Whenever a perform a swing with the 9 iron the trajectory of the ball is really really low. I do not have such a problem with the other irons. Has anyone experienced the same problem? If yes, any suggestion?