In general terms, you gear for a maximum rev range, I haven't raced comer for years so I couldn't help you with the detail, but for _EXAMPLE_ in max we gear towards 14,200 at the end of the straight (mainly because its rev limited there), but the principle remains the same, you gear towards a max. After that, the gearing should be around abouts right, you then "fine tune", so if you're not getting enough pull out of some of the twisty sections, you add a couple of teeth, admittedly you will rev higher on the straight and not pull as much top end, but the time you lose there, and more should be gained through the twisty section. It also works the other way round, if you can get through the twisty sections but people are doing you into the corner at the end of the straight, you take off a couple teeth to get that extra speed.
You also want to take into account the weather conditions, in the wet you might not be on the throttle as early, meaning your not going to be pulling your max revs at the end of the straight, meaning your losing time both top end and on acceleration. Aslong as you know the basic theory behind it your sorted, it's not at all complex, find the quickest weather/gearing combo for your driver, some people prefer an extra tooth because they're early brakers, and vice versa.
Power band wise I have no idea, I race max which is totally different! Hope this helps a little! Im not the best at explaining things, nor do I know the most, but thats how we raced back in S60. After a while racing you should have a good idea of chassis/gearing setups for all conditions! Best of luck!
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