Depends on how you ride really. There's a lot of stuff at Thetford where it helps to ride out of the saddle, so the higher gear would help. 40 x 17 would be a bit tough in places.
Should I keep the long stem on that has me pretty stretched out for road riding or swap to a stumpy little 50mm to add some off road twitch and make bunnyhopping and shit a bit easier?
So basically leave it as is? That's my kind of mechanicing.
Yeah, 26. I'll blame any slowness on being slightly over geared, not a total lack of skill.