I check mine every time I take it out of the case. However, I RARELY have to do any adjustment to it, other than when I change strings. Mine is a GB7 - Gotoh style - attached to a Jazz V MIM Fender. Which means, yeah, it's on a B string dropping to A. And yet, no problems.
Just be diligent; go back and forth between standard and drop until you get both notes in tune. You can follow a "process," and no doubt it's a sound one, but if you let it bog you down you can always "fiddle with it until it works". OTOH, maybe that's what you've BEEN doing, to no avail, who knows. In any case, rest assured that this is not a fad product, nor a bad product. It will serve you very well in time.
