correction: I accidentally wrote that my front was 44, it was, as noted in the post previous that, my front is 42, so my biggest is 42x10 (not 44x10). But, considering your terrain, maybe a 44 or what about a 46 up front? Go with the eagle in the back (and thus eTap) for a 52 in the rear…
For comparison, I rode an Open and found it a bit of a laggard on the road. That was on a test ride on pavement and trail and later on a Mauna Kea attempt (approach from the west, starting at Waikoloa; I completely forgot to bring my own fuel and hadn’t really trained for it, in the six weeks prior did a 70.3, Zermatt Ultra with 8k’ of climbing, Long Course Weekend Wales - Iron distance), decided to quit 1k’ from the top due to lightheadedness. The Open was, as a wrote, a laggard on the pavement but good on the ash/dirt. The Open is a mountain bike that does road, according to Gerard Vroomen, while the Exploro is a road bike that does mountain. For me, the difference was clear and I picked the Exploro. But that’s just me. I tried others and almost went with a Santa Cruz, but I’m very happy with my Exploro, which works great for me and the terrain I ride.