Scales are very important to a door car set-up primaraly because the driver is offset.
But with the type of dragsters we run and of the thousands of combination variables, there is no set formula for front to rear weight %'s for the basic style of cars we run that if there was a 22% to 78% standard fomula for all cars but yours worked better at 25% to 75% THEN---that is the standard FOR YOUR CAR.
It was years before I knew what the front to rear was, only because GG's wanted to get weight data on the cars and the scale would only weight 1/2 the car at a time. And there were times when I had to stick a different driver in place of my regular one and there was 60# difference, changed nothing and the car still did everything the same.
Now modern big show racing is different. There are standards for the cars themselves both funny and dragster, and the teams with multipal cars and because of all the data they collect are able to baseline a new build at the shop and even with that they still move things around. There will be a time in the near future(or they are doing it now,they are not telling) that they will have track specific cars (like NASCAR) based upon what works best at that track at that time of year haveing that type of weather. with the data collected and hopfully a consistant track prep, will move weight %'s to optimize that condition at that track.