The open face Pyrotect is what I use for auto-x, fits the bill. It's relatively light so your head doesn't feel too weighted down.
With the open diff (or even the VLSD for that matter as it sucks) you have to experiment a little. Rather than being slow in fast out, you can increase entry speed a little and as you start to turn in you give a small throttle lift to get the rear to step out just enough so that you can zero steer (turn the wheel back to center while the car is still rotating). As the car starts to settle down and you've got it pointing towards the next gate you can start to squeeze back on the power without too much wheel spin. It's not easy to do but it is rewarding when you get it right.
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