I run my rear backward for climbing traction as u suggest, its great.
If you’re running a High Roller and you’re worried about climbing traction, I suggest you’re running the wrong tyre. They’re great tyres, but they’re not designed for good climbing traction. Pick a more all round tyre than a specialist DH tyre if you want it to go well uphill too.
At work I have to deal with directional tyres in adverse conditions , keep coming across guys who have fitted them (obviously) backwards for more ‘performance’, then complain about rough ride, poor cleaning, fast wear etc etc , as said , those Maxxis guys know sweet FA.
What he said… Maxxis know nothing indeed! Hence a complete lack of dominance in the world of DH racing for ooooooh I dunno, a decade or more! 😉