i found that with the corner scales is was only any good for placing electrics to get a rough balance of the car,if you set your car up race ready then stick the car on the scales you can then see how much difference there is ,but shocks length play a big part in it,its to easy to induce shock tweak with scales,i dont use scales anymore,i have never seen a top/fast driver using scales at the track,for front to rear balance put the scales under the chassis front and rear and move electrics/lipo around to get it right,then you can do the same by putting the scales side by side and checking side balance,then you at least know that the chassis is balanced,the suspension needs to be perfect,ie shocks built the same,same length and the collars are wound out exactly the same amount,i mark the collar when they are wound up to the top that way i know they are exactly the same preload when wound down to the spring