Don't 6D unless it's in the corner to keep him locked down.
If you 6D mid screen he's going to cut it (j.C) and that'll limit your movement a bit.
Try to have a cloud out at all times, he can't cut them anymore. At the same time don't just do it, you get punished hard for that. Low to the ground J.D is good and builds a decent amount of meter even when blocked.
I have other little specific shit that I use in the matchup but it's all situational, like most of Arakune's shit.
Matchup is probably 6-4 Cause Hakumen has that guarenteed damage, where as Arakune needs to curse him to get anything good and even landing a curse doesn't guarantee damage. But that's in every matchup! :8/: Dumb character.