Now I am not there so realize my comments are coming without seeing the rig, but my first thought when I read your post was 6 ga was too light. With wiring I tend to always go heavier and to be fuse happy.
Every lead coming off the battery needs to be fused within 18″ of the battery or closer. When there are multiple cables there might be several fuses mounted in close proximity. For example, if one large cable is feeding three smaller cables, the protection has to consider the smaller cables. If only the larger cable is fused, the smaller cables will not be protected.
I would focus on fusing and sizing one lead at a time. I am glad to hear the damage to your rig was not extensive. 🙂
Steve and Andra
2012 F350 6.2 gasser SRW LB
Fab Fours front and rear in case we run into a rhino
2019 Northstar Laredo SC