well i have the good fortune to say my game doesnt just doesnt turn to crap anymore (ever since pool school). Yes i have days i shoot better than others, but my overall level of play is staying very near the top and im thrilled (of course after i type this im sure the next time i play it will all go to hell lol). In the old days when my game rollercoastered, for some reason changing cues to an old standbye meucci sneaky pete with a 12.5mm shaft would bring me out of it. I dont know if its something about the stick, or just the "new stick syndrome" some people get, but it would bring me out of the slump. Like cane was saying, confidence is everything......i know my mechanics are concrete, so if i miss its usually a slight aiming error, and i file it away. If its position, I figure out what i should have done, file it away. Not having to worry about it being my grip, or my stroke, or my stance has really freed up my game and allowed me to work on building up my strategy experience.
good luck