You may find the conversation on
Drawing up the entire electrical system to be informative. In
post 9 a link was given to a write-up about the surprising impact battery bank topology can have. One of our regulars wrote in
post 19 that he adjusted the wiring on his battery bank and noticed an immediate improvement.
As your house bank has 6 batteries, which is not a power of 2, you wouldn't be able to use exactly the approach described above. But you could take the route of making a pair of binding posts and bringing matched cables from every battery to the posts. Or you could do 4 of the batteries in the confusing/balanced way, at least. Or wire them in a parallel chain and take the positive and negative taps off opposite ends. Each approach is a little "less good" than the prior, but we rarely get to do
everything in the most optimal way.