Bathroom scales are rubbish

Ok i never expected them to be accurate, but thought by calibrating them to each other they would be good enough to set corner weights. But the repeatability accuracy seems to be about +-4kg!!! So thats scuppered that cheap plan. So the car is ready to go apart from the corner weights are not setup, i'll just have to put up with it for this race as i don't have the time to get it sorted before Brands