Well, it sure doesn't sound underfed. That's a really hard question. Is it male or female? Females get MUCH girthier than males. Mike Wilbanks ( www.constrictors.com )has a female albino that is about 16-18 ft long, and weighs over 225lbs. Bob Clark has a female 'tic named "Fluffy" who's 20+ ft long weighing over 300lbs. But I've seen 14ft male tics that weighed 50lbs and were healthy. You might want to go to some of the bigger boid forums and check out the pics, see how yours compares visually.

***Edit*** I looked at the pic you have posted on your original thread about this guy, and he looks healthy to me .