Maybe I haven't made enough swords and daggers, but there seems to be a problem with the quality equations (the 300 cap that isn't there, not withstanding). The handle if it is of higher quality than the blade seems to be the only determining factor in the filnal quality of the dagger or sword.
Example knfe handle -- 291, dagger blade -- 156, dagger kit -- 291, Dagger --331.
I can work with the system as it is, but it just seems to be totaly unrealistic. The blade should have the majority of the effect on the final product quality. Even though the grip of the dagger or sword is important it is the blade that is the business end.
And I know this is more of a bug report than a wish list. Cause I think your current equations doing what they do, are well, bugged.