Raising the rear

yup
there is a time and place for everything, and skyjackers are not meant to fix busted springs

(but if you do decide to use them, they make extended shock mount (not spring shackles) that allow the shocks to actually work as designed while lifting the car. think about it, if you use the air shocks to raise the car 3 inches, that is 3 inches less of shock travel you have)

now, none of this will solve the issues mentioned by blu