Use a much more bland texture as base, and then use decals for the damage/scorch marks.
Lots and lots of decals.
Also, the base texture should probably either be larger, or have multiple layers with different texture coordinate stretching, that aren’t just even multiples like 1 and 2 – larger differences like 5 versus 7 will work better. (And the actual texture coordinate calculation would be divide-by-5 versus divide-by-7 to make it “larger”)