Plugging two FW 800 drives into a single FW 800 port

For some reason my iMac 11,3 won't either let me daisy chain two FW 800 devices with each other, such as two XCellon FW0813 Docks, or use a Lindy 32911 3 port firewire hub to connect both drives and the computer to.  The moment I add a second hard drive neither is connected.   Both docks work fine individually.   While I can connect one via FW 800 and one via USB 2 that's too slow.    What kind of device allows me access to two hard drives through FW 800 at the same time?
And no I don't want to buy any more cases where I have to screw in any drives and hope the power supply stays good forever.

Lindy was kind enough to offer me a test hub to see if it made any difference.    Even trying with two 1 foot cables without the hub, connecting Firewire to Firewire on the drives didn't help.   They suggested cable length might make a difference, and it doesn't.  So the question becomes, is my computer's aging clock battery possibly to blame?    It is after all a refurbished computer dating from 2010, and while I've not seen any other clock battery symptoms, I have to wonder.    Maybe now is the time to bring both drives into the genius bar, and see if they can help me test it.     That will take some work, as the nearest genius bar is in a busy part of the city.
Before I go that far, any other suggestions?

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