Glad to hear you found it.
Do you really have 6 group 31’s fit in a 37’ boat?
The rule of thumb is to size the charger for at least 10% of your bank size; preferably 20% or more for AGM’s. That puts your 40A charger quite a bit on the low side. You may want to consider whether a larger charger would be worth the investment to preserve the life of your AGM’s.