Clay-man, as Charlie-Watt says If you've done the locking tuners, nut sauce, checked your intonation and sdjusted the springs, you SHOULD not have any problems. I, without exaggerating, can trem down till the strings are pretty loose and still be stable. You can also look into a Trem-lock system that returns the bridge back to a fixed position-works really well, have used them before, except I am stable enough not to need one. I have my bridge adjustment set as follows. The 2 bridge height srews are completely down into the body as far as they will go for stability-even if you have to adjust the neck position with shims to get the right playability on string height) The individual string height adjustments on the bridge are kept as close as possible to the bridge plate (same reason). I adjust the 3 springs tension to keep the bridge plate parrallel to the body. that leaves me with about a half step up and full down trem action. The idea is to keep and physical movement of potentially moving parts to a minimum, especially the string height screws. Should do the trick. Let me know if any of this helps. Same thing for the 600. Never used a graphtec nut, but have heard good things about them and if they are anything like the piezo's, they should be very nice. Bob