Re: zr tremolo floating operation
just try it, it is very easily one. If you don't like it, switch back to ZR...
I ripped out the two extra springs after a couple of minutes, because I did not like the extra effort to move through the zero point especially when only doing some soft chord vibrato. I never put them in again since it is the smoothest Floyd based system I ever used. No tuning problems at all, great sustain.
In fact: the whole guitar is the best deal I made on guitars so far. It is a S670FM and it nails fat jazz chords to EVH to quacky strat sounds. Love it...