I have the same tires as you do. Are yours filled? Mine are, might that make a difference? Again, at rest my tires are hard against the fender. With a load in the rear, thats when the real rubbing begins.
Now that I look again at your photo and at my tires, my sidewalls bulge out much more than yours do. Maybe overinflated? Can I check the tire pressure with the tires filled? When I tried, the Ballast Star material came shooting out.