So, hello. Can you change the Digger Sharpness, or is it hardcoded? Because ive looked at the Diggers.ini file and found nothing.

Yes, though the location of the diggy particles depend on which one you're looking at. The default non-faction vanilla diggers, however, have their ammo and particles in Base.rte/Ammo.ini, and can be located easily by searching for "digger". Note that the Turbo Digger also uses these particles for the digginess.

also i just noticed that there is a null bullet now, fancy that

Well, now the heavy digger can have its name. Thanks Shook.