Outside the of the box question

So I have King OEM coilovers. They came factory set at more preload on the driver's side, I assume to accommodate for factory lean (driver, gas tank weight). I read about some using a higher spring rate to reduce preload and keep height. I read some shimming the driver's side.
If spring rate is a concern for weight, and people are spacing coilovers that are not adjustable for weight (leveling), and cranking adjustable springs are set with more pre-load for weight on one side - why not use a higher spring rate on the "heavy" side and keep a fairly close pre-load on both sides (adjustables and fixed coilovers)? Seems odd to pre-load the shocks differently for weight and stance reasons, affecting up/down travel if springs can handle that.