I don't even feed newborn ball pythons fuzzy mice. The smallest they ever get from me are hoppers and they get upgraded pretty quickly from those. You're hot spot is too cool, but make sure you're measuring it accurately before increasing the temps, too cool is better then too hot. One of those indoor/outdoor thermometers with the probe on a wire are usually pretty cheap. place the probe right on the floor where the heat is. A better choice is a temperature gun that will show you the temperature of the spot you're pointing it at. (like one of these - pe-2) The spot should be right around 90F though I personally prefer it a little cooler. Instead of bathing, I usually spray my tubs down with a hand held plant mister every so often, especially when I see them starting to turn blue.