I have yet to have this happen to me, and Iíve tuned/set up quite a few FR equipped guitars.
I just donít understand the physics of it, when the string is at pitch it exerts so much force, no more no less no matter how you tune it, or am I wrong about that?
If a DíAddario .042 is tuned to E it exerts 14 pounds of pull, correct? How can tuning it all the way up to pitch before the others, then tuning the A to pitch, and so on, cause the bridge to pull up out of the body?
I donít know if Iím just not understanding or what, but Iíve never had this happen, and yes I have tuned FR trems in this manner on occasion. Not so much with the deep routs on RGs and Jems, since if you have the strings all slack the bridge is so far in the body the strings are against the fretboard, making this impossible, but with other models/brands where the rout isnít quite so deep.
Iíve even tried to make this happen, to try to figure out the physics involved and couldnít do it . . . am I just dumb? :-)