Wow, I didn't know there was such a cool program for getting an accurate measurement with a picture.I'll have to check it out! And, btw, I think you're right - the wrinkle factor seems to reduce the shedded skin's length - in my case by a factor of only 10% shrinkage.
P.S. - It's really cool your r.b. boas shed out in one piece without rolling! What kind of substrate are they on? My BP is on paper toweling with humidity in the 70-80% range during shed and has plenty of rough rocks to rub against in her tub - but I think she sheds at night in her hide because that's where I've found her skins ... right next to her in her warm hide.