Personally I never get into a slump, but that's because I am good, just ask me.
However, if I were to ever have that happen, I would go practice with a urethane ball, forcing myself to get back into good form habits.
My game is all form, so that's what would work for me, if I was slumping. Highly unlikely, because I am just that good.
In all seriousness though, that's what I do. Sometimes I lose sight of what I need to do physically in my game, because the technology made me lazy. As soon as I get back to having my good form back, my score go up.
You could try that, but I'm not sure it would work for everyone?
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Ahhh Disco Biscuits!