Can only tell you what is in the POH and weight schedule. Can't see the weight schedule being wrong, it's from a highly respected and well established eng facility that we use all the time. I have flown it, and do so quite often at MTOW using our own figures and it flies perfectly well, performing to book figures. According to your (and everyone elses opinion) it would seem I'm flying it around 150 lbs overweight. Something's not adding up if you would excuse the pun.