Hey, as long as your taller then 65", I dont see a problem. The reason they are telling you 58-60" bow is so at your draw, the working part of the limbs are being worked. But, with that being said, there is no hard fast rule on a specif length bow for a particular draw length. I myself like 64" bows and own two 64" Blacktails.
One of the fastest bows I ever owned was a 60" Border black Douglas swift TD. What I did was set up a video camera and shot so I could see how the limbs unfolded, stored energy and released. It was pretty cool to see how the limbs loaded up then the tips laid back. On the loose, everything worked together. Very cool design!
How are you and the Blacktail getting along? I have a soft spot for Blacktails. Not only do they have the looks but they also have what it takes under the hood to take care of business!
Nice pick up! Post a pic or two of your bow. I would like to see that wood combo.
Enjoy!