SFAIK at this time, we are not required to sign /x when operating away from home. this can cause confusion as some do so and others do not. when operating digital mode, the most efficient method to avoid confusion is to not sign /x which then allows you to include your current and correct grid square which sometimes indicates the state. and if you do this, then add at least a note in your QRZ page indicating which grid squares correspond to which state.
this may or may not help GridTracker as I have no experience with it. I usually just use the QRZ listed state unless there is another clue like a grid square that does not match.
as a matter of grid square trivia, FN41 where I am located, could be CT, MA or RI although the vast majority of it is RI.
back way back when, if we wanted to operate away from the location specified on our license, we had to write the district engineer and let them know start and end of portable operation. it was a big deal then, much less so now from a legal requirement standpoint. again SFAIK. Jim/N1NK/Tiverton RI