DONT run strait water in your shee, unless your wanting more problems.. 230 isnt terrible, you just gotta get moving (shouldnt be 230 for long), if its still getting hot at low speeds you might be too lean?? How many jets did you go down? But get the coolant in there, i run regular premixed coolant, any type will work fine. Alot of people like engine ice, although i've never used it before, all i hear is great stuff about it.
Eric