The collector at the site I linked didn't offer any support for his claim that '55's were lighter (although I think he was comparing them specifically to the '54's). I like hearing there are some really heavy '55's' as it endears mine even more to me - the light weight and feel of the fat v-neck are my favorite features of the old guitar. When you say the '55's are not generally lighter, is this based on a compiled list of weights? If so, how many samples from each year have been collected? I'd love to see the data!