Another case where batteries won't charge, but system has been in use for over a year

There was one person getting info on her RV with 4 panels, and her batteries wouldn't charge. The first part showed that the folks that answered thought it was possible her batteries were not deep cycle but car starting type.
I have a very similar situation, and it will probably be a different answer. In my case, we have been running a 5 battery bank of Walmart marine batteries about 95 amp hours each. !2 volt parallel wired. Last summer we were able to run our 115 VAC deep well pump for about 2 hrs a day, We had the 5 battery bank, but of course only ran it while the sun shone. We have an Outback flex 60,at the time our PV consisted of 970 watts and peaked at 25 amps in according the the Outback readout. I turned all other fixtures off when running the pump. According to the paperwork, the pump surges at 3000 watts and the constant watt needs is 1800 watts. When I run it, the Outback shows the volts out to be .647 and thereabouts. It seems to be able to handle the 3000 watt surge. The inverter is a 3000-6000 watt 12 vdc to 120 watt AC, have tested its output with tester. It is a Harbor Freight cheapo, which has worked longer than the 5 inverters we had before it. (at least a year).
This week we added 950 watts, running 2 awg size copper wire, they should have added 25 more amps, (the goal being that we can run motly off current sun power rather than battery power, leaving the batteries for night use) but the Outback is still showing just 25 amps coming in. When i check the wires with a clamp tester, it looks like 50 amps coming in, and as the Outback is 60 amps, that should be fine, but it appears that the Outback may be preventing it all from coming in.
When we tried running the well pump on the new power, (total about 1950 watts) the first day it ran about 10 minutes and turned itself off- i let it rest 30 minutes, then I could run it again 30 more minutes- enough to fill the 350 gallon tank and then have a little over for pressure.I was able to run it in spurts like this a few times over the day.
The next day It would surge and stop, surge and stop, all day,.It would never run.(I turn it on with a simple manual switch) So we are back to the gas generator for pumping water. Boy is this ever frustrating!
For the rest of our usages, no stove, computers are about 200 watts max (laptops,) the TV is 280 watts, the lights are 100-200 watts max, with all on at the same time. *Usually about less than 100 watts at a time. We heat with wood. I would like to hook the fridge up someday. We have been fridgeless for at least a year now. I know it should be able to handle a washing machine.
Last year the batteries held enough of *charge to keep the lights working during the night- not that we kept them on but that we could use them at night when going to the restroom. And use them when getting up early for work.
We are completely off grid, have been for 16 years.
But now that we added the new panels, the batteries are acting like they aren't holding a charge at all. They run the 4 watt christmas lights that we use for light for only an hour or two after nightfall.

I was hoping to keep adding to the system and for higher usage items, like a fridge (also saw an article where a young man added extra insulation on the exterior of the fridge and above the compressor and reduced his compressor cycling by 30%) *getting a separate system with the miniinverters on them and maybe a separate battery bank- but until we can resolve this problem, I can't begin to seriously do that yet.
What am i doing wrong?
My husband is depending on me to figure it all out as this is "my thing" and not his area of interest.