Yeah, the MIDI Outs are MUCH better and give more precise data. I even made a detailed analysis and sent in the results to Arturia, who agreed with my findings, and said they're supposedly working on them. Though, for my work, the USB drivers still work pretty well, and I still use them as a matter of convenience. But it's so easy to hook it up via MIDI. You can use the USB port with a wall wort to just power the unit, and then use a MIDI interface (like a $15 cable with an interface builtin) as your data stream. It's actually better anyway, I'm just too lazy to hook it up that way (!)
If that doesn't work, then your unit has some really major problems that need repair.