Weapon Damage Types: looking to Clear land *WITHOUT* the harvest effect

Getting REALLY frustrated here. Uzumi18 made a very small custom map so I could test weapons quickly inside the editor, [Props again to Uzumi18, it saves me soooo much time!] but the engine or something either isn’t interpreting things right or I have a loose random check someplace overriding the config for the gun.

The values:
Is Melee Damage
…and
Prevent Melee Harvesting

…are not working as expected. The melee damage part is, sure…things blow up and die…GREAT!
But, if I select Prevent Melee Harvesting, nothing blows up…dino’s still die…??? Should it not just prevent the harvesting part, and not nerf ALL damage??

Please folks. I could really use some guidance here. Am I basing the weapon off a completely wrong type of weapon, the gun? Should I just try an axe, hatchet, or pick with an immense damage radius? Perhaps a rocket launcher or grenade?