I have always had a problem with the G string going out of tune whenever I use my whammy bar. I'm not talking about dive bombs or anything like that, just vibrato and whole step bends. The other strings seem to stay in tune pretty well, it's mostly just the G string. It doesn't matter what guitar it is, I've had the same problem with several guitars. I've had ones with Fender bridges, Wilkinson, locking tuners, Floyd Rose, etc. still the same problem. Am I not stretching the strings out enough when I restring?