At first I baked my baking soda, but after a few times I stopped doing it because I'd notice almost an instant precipitation when the mixture was added to the tank. So instead I did unbaked but half the strength, I can always add twice as much to make up for it and everything seemed to work out for the better that way.
Also inquired to the "pros" over at RC as to whether or not you can over saturate a solution and simply mix it up like you do with kalk mixers, and seemed to get an affirmative on that.