I don’t have the XTX model, I have a 2007 Attak GT with a Ripsaw II track, no studs but clutched real well with 16,725 miles.
That being said I have tried the following skis…stock with dualies, stock with shaper bars, SLP Mohawks, SLP Powder Pro, C & A wider mtx ski, Curve XS and now Simmons...