Currently, ores progress every two for dura to level. This means that it’s barely more efficient to use higher level ores - while there is a limitation on items used in a build, the actual level of the craft itself is very limiting, which makes harvesting the higher level ores not worth it (for use, anyways).
I suggest a small change as follows {level:durability // Level cost per durability}:
Veldite (1 level, 1 durability) {1:1 // 1.000}
Scordspar (1 level, 2 durability) {1:2 // 0.500}
Plagionite (2 level, 3 durability) {2:3 // 0.667}
Keromber (2 level, 4 durability) → 5 durability {2:5 // 0.400}
Jasioclase (3 level, 5 durability) → 7 durability {3:7 // 0.429}
Hemorgite (3 level, 6 durability) → 8 durability {3:8 // 0.375}
Ochne (4 level, 7 durability) → 10 durability {2:5 // 0.400}
Croknor (4 level, 8 durability) → 11 durability {4:11 // 0.364}
Arkoxit (5 level, 9 durability) → 13 durability {5:13 // 0.385}
Bisteiss (5 level, 10 durability) → 15 durability {1:3 // 0.333}