but technically, 0db isnt an 'over' right
thats why i hit zero on the v3 at least a few times a show, because thats not an 'over'
It depends on how you define "over". There is no way a digital system can go over 0dbFS (decibels full scale). That is, there is no way for something more than zero to be represented digitally. So generally, a single sample at 0db isn't considered an over. Beyond that, you need to decide how to define an "over" (given that technically it doesn't exist). When you get several samples in a row that are at zero, it is assumed that you went "over" (meaning that the recorder would have shown a signal greater than zero if it were capable).
I'm almost positive that Grace defines an over as 3 or more 0dbFS samples. From the V3 manual: "The “0” LEDS are dual purpose indicators: the “0” LED will illuminate when the signal presented at the A/D converter reaches 0dBFS but will “latch” on when an “OVER” has occurred". So if your 0db indicator light was lit and had to be cleared with the peak reset button, then yes, you had an "over".