Band a Lot,
I am pretty sure that You have given a wrong interpretation to some wording of your ops manual. If you are aware of being overweight by looking at your fmc or whatever other system shows your current GW it is your responsibility to do something about it (hopefully not by riding the brakes please). The load sheet is a plan of how your aircraft is loaded prior to start your flight and how, based on the expected flight plan data, it is going to evolve. Should figures significantly change because of any change such as a reclearance you still have to ensure you are complying with the aircraft and performance limitations.