Regarding my damage problem, I found that I have a vox debug file saying this:
17 double sided triangle(s) detected in unnamed geometry.
31 double sided triangle(s) detected in unnamed geometry.
31 double sided triangle(s) detected in unnamed geometry.
2 double sided triangle(s) detected in unnamed geometry.
12 double sided triangle(s) detected in unnamed geometry.
4 double sided triangle(s) detected in unnamed geometry.
2 double sided triangle(s) detected in unnamed geometry.
35 double sided triangle(s) detected in unnamed geometry.
2 double sided triangle(s) detected in unnamed geometry.
3 double sided triangle(s) detected in unnamed geometry.
2 double sided triangle(s) detected in unnamed geometry.
4 double sided triangle(s) detected in secondary_hull:20.
1 double sided triangle(s) detected in unnamed geometry.
8 double sided triangle(s) detected in secondary_hull:20.
9 double sided triangle(s) detected in unnamed geometry.
12 double sided triangle(s) detected in secondary_hull:20.
8 double sided triangle(s) detected in secondary_hull:21.
12 double sided triangle(s) detected in secondary_hull:20.
4 double sided triangle(s) detected in secondary_hull:21.
36 double sided triangle(s) detected in secondary_hull:20.
12 double sided triangle(s) detected in secondary_hull:21.
12 double sided triangle(s) detected in secondary_hull:20.
7 double sided triangle(s) detected in secondary_hull:21.
9 double sided triangle(s) detected in secondary_hull:21.
5 double sided triangle(s) detected in secondary_hull:20.
12 double sided triangle(s) detected in secondary_hull:21.
12 double sided triangle(s) detected in secondary_hull:21.
2 double sided triangle(s) detected in secondary_hull:20.
2 double sided triangle(s) detected in secondary_hull:21.
12 double sided triangle(s) detected in secondary_hull:21.
16 double sided triangle(s) detected in secondary_hull:21.
17 double sided triangle(s) detected in secondary_hull:21.
108 double sided triangle(s) detected in Editable Mesh.
8 double sided triangle(s) detected in unnamed geometry.
1 double sided triangle(s) detected in secondary_hull:21.
1 double sided triangle(s) detected in secondary_hull:21.
2 double sided triangle(s) detected in secondary_hull:21.
2 double sided triangle(s) detected in secondary_hull:21.
4 double sided triangle(s) detected in secondary_hull:21.
9 double sided triangle(s) detected in secondary_hull:21.
12 double sided triangle(s) detected in secondary_hull:21.
1 double sided triangle(s) detected in secondary_hull:21.
1 double sided triangle(s) detected in secondary_hull:21.
104 double sided triangle(s) detected in unnamed geometry.
1 double sided triangle(s) detected in unnamed geometry.
10 double sided triangle(s) detected in Editable Mesh.
2 double sided triangle(s) detected in unnamed geometry.
Not sure what any of that means but maybe it's got something to do with it