Sebastien,
I do think that 700×55 in the rear is really tempting fate. Jay did run 700×54 at Tour Divide in 2021, and won it, but he was a sponsored rider and wasn’t so much worried about protecting his frame in the mud.
Were it me, I would run the 55 in the front and 48 in back, or even a 50mm if you have one you like.
-Stephen