Not much to say really!
[Shiro's Hollow]
* AR 8 fits a lot better than 8.5 I don't think jump distance should justify using a higher AR because there are plenty maps that are both higher bpm and use larger jumps, that play a lot better with AR 8. AR is very closely related with BPM because it determines how dense the screen will be given a certain amount of time. AR 8.5 is too high for 115 BPM
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[Insane]
AR 7 or 7.5. This is 115 BPM xP.
[Railgun's Hard]
AR 6.5 or 7. (Depending on how Insane's AR is changed. 7 if Insane is 7.5 etc...)
[EruJazz's Normal]
AR 4 or 4.5. // Same reasons as Easy, because the lower bpm means there are already less objects on the screen per minute. You can use a lower AR. Otherwise AR 5 on a 115 bpm Normal will feel like an AR 6 /6.5 on a 180 bpm Normal due to BPM.
[Inyu's Easy]
AR 2.5 or something. AR 3 is too high imo. I mean, considering that most 180 bpm+ maps use AR 3 for their Easies. A good example being Blue Zenith.
(Personally, i would have gone with 2/4/6/7/8 but ehh, i think these values are good too).