I think most pilots do something similar, although I know some folk like everything to be accurate to the kilo. Unfortunately, flying doesn't work that way. Personally I use the correction figure up to about 5T and add a fudge factor thereafter, always rounding in my favour.
Do we really need everything mandated? I would hope that most pilots can think for themselves using some common sense and airmanship... oops, did I use the A word?