Put the gravel cushcores in there. For the riding you are talking about, they will make a huge difference because they add some damping to the the air spring (your tire) as well as protecting the rim. In fact, for the tire size you are using, you might even use the xc cushcore. I put one in the back tire on my Diverge, and run 32psi with 44mm tires at 82kg. Nice and soft and no rim touches. A little less "ping pong" from the rear when it roots and rocks.
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