Although chaotic/turbulent flow is great, and very helpful in keeping this fish, I think that you would be more likely to be successful if you just had more flow of any kind. I think it's instructive that Untamed's achilles' hangs out right in front of a 1" output hooked up to a Dart pump. Maybe think about throwing a Vortech up on the side of the tank and just cranking it full blast (or a Tunze stream, or a wavebox, etc.)? Some of your softies might not be too crazy about that, but my sense is that you care about the achilles more than keeping a few soft corals happy.