s373ns

Load up CK with Fallout4.esm and make the super mutant mod .esp the active file. Go to 'items' tab and then 'leveled items'. Search for the LLI that belongs to the super mutant behemoth. Double click to edit. When you have found the weapon and have it highlighted in the window, you can choose the spawn chance. It should by default be at something less than 100. Change it to 100. You can test the loot roll in the same window to see what he will spawn with. Save the file and test it in-game.

I'm not exactly sure what you're trying to accomplish. Are you trying to get a pistol to fire shotgun rounds? Or...?

I am currently creating an entirely new worldspace. I hate to break it to you, but navmeshing is what it is. You kind of have to learn to love it. Practice using the shortcuts. What I would do is open an empty cell and toss some objects and practice navmeshing around them while utilizing the shortcuts. The quicker you can learn to rapidly lay down navmesh, the less time you will spend struggling in your mod.

I also have this problem. I don't like how no one has solved the issue either.