




You need to take the entire circuit into account. Even with the blue sea fuse box installed, the entire system is still fed with the same size cabling but now with a potential of 60 amp more draw. Those factor BUS bars are fine, its the supply cables you need to account for.
Those blue sea fuse boxes are great, I use them all the time, but making this swap does not solve your real issue here. I know I did not give you a specific answer, sorry, theres a couple puzzle pieces missing for me to do that, but youve now got some inf that will allow you to actually solve this on your own.