I also used the fluted alu 'guards on my Raven -- 650B x 52 mm. That gave me approx 10 mm total side-to-side clearance with my 26 x 1.6 Marathon Supremes (39.5 mm actual width, inflated).
If the Compass tires' inflated width is also 45 mm, then you have at most 7 mm total clearance, perhaps less. My fenders' actual width, taking account of the slight roll at the bottom of each side, was more like 50 mm, not 52.
Might well be worth trying a delicate flaring operation -- probably more difficult where the stays are mounted on the fenders. Is there a particular spot where fender rubs tire? Interesting that it's only on the front 'guard.
And good luck with the Compass 700 x 45s! I bought a pair of Naches Pass 26 x 1.75s, hoping for more volume/lower pressures. They were lovely tires, smooth and a gear faster on my Rohloff than my Supremes in most conditions. BUT, they were only 40 mm actual inflated, virtually the same as my Supremes. AND, I had three punctures in three rides totalling 400 kms.
The punctures more than wiped out the time gained from faster speed across the ground.
So, I donated my Compass tires to the bike-recycling organization where I volunteer & reverted to my Supremes. These give me a much better combination of comfort, speed and durability.