The standard for measuring DL is 28". At 31"DL, you be drawing well past the the marked weight on the bow. I'd think it would be stacking pretty bad at your DL. Meaning it would rise sharply in weight beyond 28". I'm surprised you can get along with the 52" bow. Try before you by if possible.
I would'nt "learn" to pull it less, rather, see if it can handle what you do pull.