RE: How many Creep Tunes?
The purpose of creep tuning is to syncronize the cams to roll over at exactly the same time in order to achieve straightnock travel. Spot Hogg has a good newsletter on their website on the desirability of straight nock travel.As with arrows, the straighter the better, but unless it's really bad, it's probably not a big issue for most archers.
If you have the equipment, the knowledge and the time, you can adjust your bow for straight nock travel without creep tuning.This can be done tosome single cam and hybrid cam bows.
I'm not sure if all of the single & hybrid bows can achieve straight nock travel or if it matters.Maybe someone with more experience than I have can answer this.