I currently have a 910 d3 with a very cheap stiff shaft. First i would like to know if it would be worth it to upgrade to the 913? Secondly if i currently play a 10.5 should i get a 10.5 or 9.5. I am 16 and i get better as time goes on. Lastly, if i should upgrade what is the best stock stiff shaft or reasonably better than stock after market shaft. Thanks.