I’ve never done the backcountry weeks, but just about to do my third “classic singletrack”- White Rooms are ace. We’ve done a backcountry day which I assume is kind of similiar- fair amount of climbing but with a lot of support from the vans too to take the strain off. Was quite hard work but I didn’t mind dragging around downhill tyres. Was a brilliant day tbh.
On that note,
I think i’m leaning toward leaving the Butcher SX’s on the ‘enduro’ wheels,
I used an SX and a DH last year, tubeless, not a puncture all week… I found the Butchers not at their best on the very dry/scrabbly stuff we spent a lot of time riding though, the rubber’s not the softest, but good for everything else. I think they prefer ground with a bit of damp tying it together but then we were in dustbowl August. Trying Highroller USTs this year.
321s seem pretty suitable to me… I killed a #enduro Fulcrum rim last year, but my Flows were fine the year before.