Freddievanleeuwen

If the lower capacity 120Ah worked well then you could keep the settings. Alway try the lowest charge current that works for you. Around 15% of Ah is a good starting point to allow a longish life.
With lithium so much cheaper now they remain the 1st choice as you know.

I got my GEL batteries for 1.1k each and 10 of them. 10 was because I wanted to reduce the instantenous draw from the batteries (staying within the 25A limit allows me to run 3kW from the batteries) and I rarely use more than 20% of the battery by the morning. Lowest it has been is 65% so I will easily get some 4 to 5 years out of my batteries.
If I were you though, spend the 7k and get yourself a 100ah lithium battery. Its almost the same capacity if drained to 80% as the 2x200ah LA batteries.

Thanks for the information. What a ride... I have learned so much. Thanks for everyone's input. Much appreciated.

Sorry I took so long, but here is the latest picture. The wiring was re-done as you suggested. I have not switched it on as yet.