I honestly thinking OD 9 feels a bit too busted just because its a mainly rice chart, but due to high bpm and causing it more easy of notelock e.g at the section where you introduce quad 03:21:550 - to layer high pitch electronic melody. I would suggest to just deacrease it to 8 or 8.5
it's up to you but consider to about this if you don't mind for playability aspect.