I don't really see the spotlight effect with the AIs. If you have the standard optics, the 4 70 degree pucks do a pretty good job of hiding it. The issue is if you look at the PAR data, the drop off in PAR is very steep (spotlight), whether you see it of not. The thing to be aware of, in this regard, IMO, is that moving a coral a few inches can inadvertently subject it to large changes in PAR. Having more units will help smooth this out though, as where there is overlap between the units, the PAR will sum. It's more of an issue though if you use too few.
As to the moonlight setting, I do about 2% rb 1%b. Even this is kind of bright, but it varies with the moon-phase. So, it is only maxed out a few nights per month.