I have been in contact with Motorola about the issue with Mitsubishi DVHS decks not working properly. I told them about balazer's great PC utility that is working for me. Here is the response from Motorola:
Good news! The issue is addressed and fixed in firmware version 7.14 which is scheduled to go out to cable operators by mid June. It wasn't the bit rate though. It was a handshake problem. Somehow when Mitsubishi's DVHS saw the DCT it didn't recognize it, but that has been fixed and tested in this next release.
One thing that won't work in this next release is the ability to hook up two devices to the IEEE1394 port. Even with an adapter, because the DCT won't address two devices through that port yet. So you'll have to watch your TV through a different connection like component or Dvi when you're recording through the IEEE1394 until that issue is addressed.