I’ve got 2.35″ Eskars (2bliss) F+R on my DH bike at the minute run without tubes on a 729 at the back so a pretty wide profile rim, I like them because they’re sort of like a lightweight version of a Highroller (I know fitted to a rim heavier than the moon) – no pinch flats here varies about 28-35 psi at the back 25ish on the front…
I guess what your after is the most solid reliable tire you gat have so that you just won’t have to deal with flats while your away, so I take it weight is less of a concern.
Are you certain you are pinching and not slashing them? I can see them getting cut pretty easily if you ride lots of rocks or slate, if you want to try a stupidly thick walled tire, I think I have an old IRC tamashi (Barely used) still in the Garage doing nowt, from what I can remember it weighs something like 1600g but is about as close to a runflat tire for an MTB as I’ve ever seen – you can have it for postage cost if you like… I’ll have a quick poke about in the garage tonight if you want…
The other thing to look about for are some of the older model intense tires, not sure if they still do them but they used to do some of their tread patterns in 4 ply casings, again not light, but probably quite robust…