We need a fix to inspiration versus skill

Are you factoring in the Concentrated Primal Infusion, which adds 50 to the difficulty? Base difficulty of everything except the offhand is 415, assuming my math is correct max possible skill is 342 (excluding racials) + 103.75 from quality 3 mats for 445.75. That’s enough to guarantee a quality 5 392 uninfused item or 405 with a Primal Infusion, but it’s 19.25 points short of getting a 418 Concentrated Primal Infusion. The offhand is a weird outlier with significantly lower skill requirements than most other high end crafts.