Read/write drive speed question

I've been watching the read/write speeds in Activity Monitor while I've been transfering about 250 gigs from an internal drive to an external FW 800 Weibetech Drivedock. I notice that if I plug in any other FW drive at all, even another FW800 to the back of the drivedock, the transfer speeds suddenly drop from about 43mb to about 19 or 20mb. Also happens when I plug in to the front of the Mac Pro.
Why is this... can those speeds only be achieved when one drive is plugged into the computer? How can I have more drives plugged in but maintain the fast transfer speeds?
thanks

If my schematic reading-ability isn't too off, USB is the same bridge, same controller, different bus(es):
http://developer.apple.com/documentation/HardwareDrivers/Conceptual/MacPro_0608/Articles/M43_0906arch.html

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