edit: Same results in safe mode.
oh, and I also tried earlier both normal and just now in safe mode with not only the onboard 1.1 USB controller, but threw a USB2.0 card in the PC for a moment as well (not in there anymore) to see if that'd work, if it was controller related and could be fixed, forgot to mention that in the original post. Nada. Same results.
Also, I added the status LED that would normally be on the daughterboard (with the switches) to the one of the X-Bit chips directly, based again on the pinouts from the boards here. When first plugged in, they light up (plugged into USB for flashing) but as soon as I start to erase or whatever, the LED goes out. Nothing more, never comes back, never flashes or anything. Same thing on the chips with or without the LED. Just figured it'd be a convenient thing to have on there, so I could route the LED to the front of the Xbox on clear cases, give an instant heads up on the status of the chip.