Good!
As for latency I can't really help you w/Logic. Besides its settings maybe there's any plugin to take care of that?
Consider that there will always be a latency on a computer system. MacPros ain't god, just a regular computer with all its good AND bad aspects. That's another goos reason to prefer "genuine" audio connections.
Also make sure you haven't ANYTHING connected to the MacPro FW400/800 ports. Apple makes a Pro desktop with several FW ports that all share the same bus!! How Pro is that? If you connect 2 devices, your FW bandwidth is drastically reduced. Don't connect FW hard disks, shaining them to the H8000. A dedicated FW bus (maybe adding a PCI card) is the best solution…
all the best
I
