it you can get one, a thermostat may prevent the temperature from fluctuating. You can set a certain temp, and it should prevent the heat getting above or below it.
I use one for my exotic animals with success.
If you get really worried, a brooder plate might work better, thats what I used...
they dry pretty fast, but sometimes they dont fluff up as quickly. If they feel dry to the touch, you can probably bring them out now to let them finish fluffing up in the warmth of the brooder. If they still feel damp, I'd leave them in the incubator a little longer.