WT will be fine on a 27mm internal rim ime- I have a dhr2 2.4 that I’ve had on 30mm and 25mm internal rims and I can’t tell any difference (and a nont-WT 2.5 which really just seems the same). IMO it’s mostly just market differentiation.
But the 2.3s would be good for this job too- lighter and a little faster (it’s not gamechanging but on a pedally trail you’ll probably notice). And also cheaper, the WT 3C is still £50+
(if you want epic grip, don’t rule out the 2.5 exo dhf, it’s a beast. I can’t decide whether I prefer it or the dhr2 2.4)
I wouldn’t choose an XC tyre, it’s not the same job. In principle there ought to be a middle ground- something like a nobby nic- but in practice there’s not a single tyre in that niche that’s as good as a minion imo. No point getting the right sort of horse for the course, if it’s lame.
Lists DH tyres
None of those is a dh tyre.