So the fact that your airplane is so much lighter than every other C 152 in existence doesn't concern you at all ?
There has to be a 152
somewhere that is the lightest, maybe this is it. I have a feeling that even if I took it to the shop of your choice and they weighed it ten times you still wouldn't accept it. Also let's say you were right, how come I can fly it at MTOW and it operates in a perfectly acceptable way? No sluggishness getting off the ground, 100kt cruise at 2,400?
Four other weight schedules from the same place:
PA28-161 Warrior 2, weight schedule 1532 lbs. Does that sound about right or is that 100 or so lbs too light?
Exactly the same model as above, weight schedule 1448 lbs. Crikey it must be a mistake, how can it weigh less than the one above? Ah, it doesn't have a DME and other goodies.
C172 with standard tanks and 160hp engine, weight schedule 1483 lbs.
C172 with long range tanks and 180hp engine, weight schedule 1545 lbs.
Do they sound about right or are they all underweight too?