People with the drying chicken need a crockpot that seals. I think I mentioned this earlier, but I generally pick a sauce and veggies that go well depending on my mood each weekend, crockpot four or five chicken breasts for anywhere from 5-8 hours on low, and never have a problem.
My crockpot seals, moisture doesn't escape. I have never had dry chicken. I always use breasts, and fairly cheap ones (like the bag of frozen ones from WalMart lol). Sauce and veggies always make it delicious, and I usually shred after 5-6 hours then cook shredded in sauce for another hour or two.
I don't even use timers. Just put it in there when I wake up, and when it's close to dinner k shred it and then let it cook til dinner time.
Never been dry.