I agree, using a kenetic bullet puller used to measure neck tension is not a very good gauge... Muznut is spot on, heavy bullets will and do carry more energy once you get them moving. Its simple physics.
I have seen what appears to be a heavy crimp actually REDUSE bullet tension cause it disrupts/breaks the surface contact of the bullet to the neck.
NECK TENSION starts and ends with the diameter of the pilot in your set of dies. If its too large, you will have little tension, if too small, its hard to seat a bullet and neck tension will be high. You can purchase different diameters form the die manufacturer OR make what you have smaller with a drill press and piece of emery cloth. (GO SLOW!!)
BULLET RE-TENSION is your crimp. Personally I see zero need for a Lee "factory Crimp die. Its a solution to a non existant problem. I have never had a problem with the roll or taper crimp that comes standard with most die sets.
This is people mix up the two (Or do not understand) and blame the other, then go buy a "Factory crimp " die and proclaim they have found the "cure"... Go back to your loading manuel, most will have all the info needed for how to check and adjust this.
CW