The old rule of thumb of...."to get a bow roughly twice your draw length, for comfort and bow longevity"....does NOT work for me at all.
I'm a small framed guy of 5' 9" and weigh 156 pounds. I've also got small hands with orangutan length arms giving me a 30" draw length. By following the old rule of thumb, I should be shooting a 60" length bow.
I once owned a 60" Bear Super Kodiak and that bow gave me a SEVERE case of "finger pinch" since it made my right index finger very sore after 15 minutes of constant shooting. I sold the 60" SK and eventually bought a 64" Bob Lee Signature Hunter.
After constantly shooting the 64" SH for 45 minutes, I started noticing the tell tale signs of finger pinch coming on since my right index finger was starting to get sore. So, I sold the 64" SH and bought my first 66" Blacktail.
With my 66" Blacktail, I shot for 4 hours straight and never experienced the right index finger pain which is associated with "finger pinch". I loved my first 66" Blacktail so much, I bought a second 66" Blacktail. My Blacktails are the only two bows I now own. BTW, my right index finger does not have a callous on it.
In closing. I let my right index finger tell me what's the proper length bow for me to shoot and not some author of a book; whether the author of said book is a well known target archer/instructor, a well known olympic target archer/instructor or a well known bowhunting archer/instructor.