Spiral Dodge seems pretty standard. Try buffering IRS into a jump.
IRS can be canceled into (essentially) three things: dodge, a jump, or E&I... and you can actually do a glitch with Angel Glide. But I've noticed that moves are heavily buffered while you are performing IRS, and Dante will perform the last buffered attack once IRS is over... but here's the funny thing, it also happens when you cancel it.
Here's what I mean, do this: IRS -> (buffer any attack, Aerial Flush is fine) -> perform a jump to cancel out of IRS. If you're quick enough, you will see Dante go into IRS and then cancel into Aerial Flush (instead of the jump that you performed last)... you can also do whatever after that, like Instant Drop.
On the instant drop note, there is a lot of ways to set your timing perfectly for an instant drop... the way I almost always do it is by doing a jump and perform Hanger with Osiris (the whole thing) and then end it with a drop before Dante hits the ground.