My Pirelli MT90 on the back has now done a few thousand km which included 3 off road trips and I've been very impressed with them. And my MT90 looks less aggressive than your MT60's. I have a lot of faith in Pirelli tyres so far.
You should get good results from them [emoji4]

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2014 XT660Z - Barrett pipe, DNA stage1.5, Barkbuster hand guards and handlebars, Pivot pegs, Teknik suspension, Guard-it engine protector combo, B&B rear rack, Trax topbox.