The Rear Pad on the Slipper, Part No.A3224, is not the yellow foam colour pad, its a more abrasive material in grey, almost brake pad like.
I run my XX4 with a 7.5T Brushless setup and I have to back off the Slipper Nut quite a way to get the thing to actually slip!
I've never tried using the yellow pad on either side of the spur before but its possible that this may be part of the problem. I've also seen the wrong spring installed which was too soft, it kept slipping pretty much when the Tension Adjustment Nut was tightened all the way down.
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