late model setup problem

Hey Bob, or anyone else that might be able to help. hope you don't mind me asking a setup question from you. We are stuck with a problem that we can't figure out. We have an asphalt limited late model that we run on a 3/8 mile slightly banked track. We run coilovers. We are not experts on chassis as we are learning more each year, but we are also not completely dumb with it. We try to study things, ask why, try things out etc. Have read your book and search the web frequently. Last year we had a pretty good grip on things. we knew from our notes what percentages the car liked and the car ran really well. We could get the car back to those settings at any time even after 2 wrecks and various suspension replacements. We could always get it back home with little effort. Over the winter months all that we did was replace some body panels, replace a lightweight drive shaft with steel (heavier) because of a rule change, installed 2 new rear shocks of the exact same type and had to move our rear axle back less than 1 inch to meet wheelbase limits for another track. We used our notes from last year to put the shock collars at the same points, ride height the same, panhard etc.  We squared the rear and strung the car and set toe. Everything is as close to last year as possible. So we put the car on scales and start our scaling but for the last 3 nights we have pulled our hair out because the car will not go back to what we had before. It is resisting everything we do to get our percentages back. It almost acts like things are going backwards. We did not just forget how to do things from the last 2 years, but we can't figure out why the car is doing things it's doing. Frame rail lead is in the same place and driver weight hasn't changed but now we can't get our LF heavy enough, the RF is not heavy enough and the RR is too heavy. We crank on the coils and try to do small adjustments on all 4 each time by using half turns in  and half turns out on the opposite coils to try an keep ride height. We crank RF weight in and the RF actually looses weight and goes to RR. Every adjustment we make seems to react almost backwards from what we used to do. We bounce the car after each change. We do have new scales but we tested them to make sure they are reading ok and plugged in on the correct corners. At times we are close but wish we could actually flip flop the corners to be exact. We are not yet at the point of fully understanding and documenting roll centers etc, but with only the few minor changes from last year, did we change the car so much that we have to do something completely different from what we did last year?? Or are we so out of whack right now and just have not found the right combination to adjust the car? I know you would need more info than what I am giving you, and it's hard to explain exactly what we have done word for word, but we were so confident last year and could make changes and the car would respond and get right back to our baseline settings. Now we can't get it anywhere near that. How could it have changed so much?? Not asking for a miracle but can you think of anything that would get us back on track? Thank you very very much for any info you could send my way.
signed, very sleepless in Virginia.
Dan  

It sure seems like your scale wires are crossed.  When you say you tested your scales did you put them on the floor and load them up one at a time with your buddy standing on the scale to make sure the R.F. is actually the R.F.?

You said both fronts are light - is your total O.K.?

Moving the rear axle backwards would lighten the total rear and increase the weight on the total front.  A 1" movement of the rear axle will reduce the rear weight by about 13.2 lbs if the car weighs 2800lb total.

Check your sway bar - is it disconnected? (although this would not explain your problem)