Macbook pro with 002 (firewire connection)

[Nicky2]

wondering if there is any issue with this setup.....
I'm going from a macbook pro (new 15 inch I7) firewire 800 to an external firewire multi port drive (Ministack V3 from OWC). I'm connecting from the mac's 800 port to the 800 port on the external drive, then out a 400 port to my 002.
I've read where you should use a firewire drive that has 2 400 ports, and use an adaptor cable to go from the computer to the harddrive.
Is it ok that I'm connecting the mac 800 to 800, and then 400 out to the 002?

Also, the external drive has a usb hub built in. Can this potentially cause conflicts?

I have been up and running with this computer for just a few weeks. I am getting occasional "increase buffer size errors" (trying to run at 128) and occasional "running out of CPU errors". Running sessions with only virtual tracks, no audio, with Ivory, Stylus, and Trillian. I thought with this computer, I wouldn't be seeing these errors. Is it possibly related to the way I have the drive routed to the 002?
thanks!