Vacuum And tuning Help

well i want to thanks all of u for the help so far!! i just got my light springs in the mail and was looking over the "directions" that say race cars only! =P~

anyways it said remove heavy stock spring and install new light spring adv should be full around 2400. now Edd j in Paradise CA, the slant guy who helped me build this monster told me to get all in around 21-2200. so my question would be should i install one spring and slightly stretch the other?