very nice plants you grow!
BTW are you sure your N. hamata isn't a complex hybrid? Especially the shape of the lower part of the peristome differs slightly from what I would expect from a pure N. hamata. The shape of the peristome resembles those of some clones of N. tentaculata. Also the the biggest pitcher in front is slightly more bulbous than I would expect. The size of your plant exceeds the size Turnbull and Middleton mentioned in their type description considerably. (The picture of the lower pitchers in Flora Malesiana shows these differences quite well.)
Of course my impression might be due to the bigger variabilty of clones I don't know of, your growing conditions or the angle the pictures were taken.