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I think you're doing the smart thing Amy. As for running more than one cycle, no need to do this unless the foam is really dirty. If it is dirty, and you see a brown scum line around the side of the tub, then you will want to do another cycle. Basically, you want to see the foam from the Ahh-Some be pretty clean. If it isn't, then do another cycle.
I should point out that my tub was built 3 weeks prior to arrival at my home. It arrived only 6 days after it was wet tested so unlike others, mine had very little dwell time for things to grow. I also started it with a chlorine level of nearly 20 PPM to kill off anything that may have been in there.