EASY - Don't follow the doctor's advice, and inviting significant detrimental consequences may be at hand. Obviuosly, consequences in this case, do not have the reprecussions as the aforementioned.
Listen to the professionals!!!
Note: Hunted w/64" LB out of a std DB Matrix last year with a little trouble but mangeable (I am 6' 1"). Having been using a 62" hybrid LB this year out of my std DB Matrix and suprised to say that I have been quite comfortable. A 58" bow will provide you ample room. Not to sound like a hypocrite, I have a 56" Thunderchild on order. I initially was going with the 58" until Big Jim strongly urged me not to and that I would be doing an injustice to his 56" design. Have always preferred longer bows and even the 58"r was in uncharted territory. If I had little faith in my bowyer, then I sure would not order from them.
Also, note it would be finacially advantageous to BW if they could recommend, in good faith, extended draw ranges per their particular designs.
***Listen to the BW professionals!!!***