Yep, shoulder width, shooting form, and bow grip style (high or low wrist) all contribute. I'm 5-6 and used to draw 28ish when I wore glasses, since my Lasik surgery 15 years ago my form and anchor have changed a bit, I stretch out a little more, and I pull a true 29+. My shooting has improved, I get more zip out of my bows too.....oh yeah, to the question at hand, as far as I'm concerned the longer the bow the better. I shoot recurves and have shot 64 inch bows for years, shooting a 66 inch recurve now.
Ryan