Yeah, the Griot's sprayers are nothing special. I have a bunch of them and they sometimes quit working right- and yeah they don't adjust quite as well as I'd like. Oh, and I dunno about their bottles, either. Mine often break when they get dropped on the (admittedly hard) floor.
My sprayers and bottles from TOL and some "industrial" ones from the local big-box work better than the Griot's ones.