your bridge is rising out of the body coz the string tension is greater than that of the springs that control your bridge, so you gotta increase the strength of the springs in order that they both balance out
in order to do this, remove the backplate yeah, then get a screwdriver and loosen the screws until it the bridge is horizontal
now, tune your axe in again
chance are it now wont be horizontal
so, loosen/tighten the springs, then tune
keep repeating this till it is level... this can be frustrating and a bitch to do, may take upto or more than an hour...
have fun!
