The 31t sprocket with the 22's should not put too much strain on the belt. I use that combo 99% of the time. OEM Stock clutches have always held just as good or better than the aftermarket models. I do use 12G rollers, 14's are a bit sluggish off the line for my taste.
Whats your internal trans gear set combo? Using a 14/41 set will give good pulling power.
running a length of "shop vac hose up to the cage will work good. The air doesn't have to be strong or forceful, The variator just needs a clean fresh source. I got a old uni on the end to filter dust and whatever.
Best thing I ever did was to cut out the center of the plastic clutch plate on a howitt cvt cover. Epoxy in a screen basket to hold some filter material. My cvt cover used to get too hot to touch. This outlet over the clutch cooled things down dramatically
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