I'm not sure you gain any perceivable power due to the curve of the blank. The significance of finding the spine has been blown way out of proportion, IMO. I'm not saying that about any person here, but in the rodbuilding community in general. If you think it makes a big difference, put a rod together with the sections offset and see if you can feel a difference when casting it. I'll bet in most cases you won't.
In any case, most casts have a backcast and a forecast, so again it doesn't really matter. Put them on in a way that is most aesthetically pleasing to you, and the rod will perform exactly as it is designed.
BTW, in most cases, I wrap on the inside, but have been known to wrap on the outside on rare occasion.