Neil.
The basic idea is the heel-toe orientation of the club at impact. Which, yes, too flat means heel raised toe down will cause the ball to go right. And toe up heel down will cause the ball to go left(too upright).
However that is just one part…
If you are a 0.9 handicap then you could be playing any iron in the titleist line up. But if you are between the ap1 and ap2s then i would definitely go with the ap2's! Smaller, softer, forged. Go hit them both and see witch one you like better!
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I am 15 too and eventually seeking a sponsorship. Just build up your resume and play in lots of tournaments :)
Titleist is not coming out with a mixed set. It is going to be the normal MB, CB, Ap2, Ap1. If you go on TGW.com and go to customize you can speciffiacly order the irons individually. I am getting these too... Can't wait.
For me it was just a psychological choice to go blade at 8iron because I feel like 155 and in, I should have the green light to attack pins. For the cavities 7 iron and up, I wanted the make sure to lower expectations and hit greens. RC