I pull 31.25" and am shooing a 62" Caribow Tuktu EX, it's smooth as silk and because of the static tips, stringed length is 4" shorter than my 62" Peregrine longbow.

It's perfect for hunting timber, spot and stalk, etc.

Like Terry said don't change your form if you're shooting well already. When looking for a new bow, check with bowyer's and have the correspondence/conversation about what they do for longer draw customers.  I can see two to four inches of bow length savings because of more static in the recurves or shorter riser longer limb combo, etc.  However a claim that 'my 54" bow will shoot the same as anyone else 64" bow at 31" ' should be received with a healthy dose of scepticism.

Yeah like Ray says, contact a bowyer and ask first. There's a lot of variables. Don't want to over stress limbs even if it's a draw curve that you can handle. It could affect the life of the limbs.