You have a lot of work
ahead of you. You need to figure out what settings everything is using to charge (bulk/absorb/float). This is determined by your battery mfg. They should list it, if not you'll need to make an educated guess. You'll need to setup both controllers the same. Having 6v golf cart lead acid batteries doesn't dictate your house battery bank voltage other than it having to be a multiple of 6v. You likely have a 12v or 24v system. Your charge settings will be based upon battery type and house battery voltage.
You could be ruining your batteries right now, or not, it seems neither of us know this yet.
Before you had 275w x 4 = approximately 75-80 amps (@ nominal 12v). Meaning your 60 amp charger was working it's maximum and clipping off the excess at the top. Meaning it was lost
forever and not used to charge your house bank.
Now you have 435w x 2 = 60-65 amps. Likely no clipping but I prefer to not run stuff at 100%.
If the sun is shining bright, you battery bank may not be able to take 130 amps (This being the sum of all 4 panels and both controllers). This is dependent on charge voltage setting, battery State of Charge (SOC) as well as the battery temperature. Higher voltage would permit
higher amps into the battery but too high risks boiling your batteries. You should be running temperature compensation to account for the change in temperature.