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My first EV started out with 8 of those Schumacher 6A chargers and it was a pain to turn each on and adjust the settings every time it was plugged in. The I got an old school K&W BC-20 which did good for years, but it did not have a shutoff so I had to time my charges every night.
Lead acid does drift quite a bit over time, you are really never going to have them balanced, except for maybe for the first 30 or so cycles when they are brand new. Individual chargers for the AGMs is definitely going to be your best bet in the long run, unless you get some shunt regulators on your batteries.
My new EV has an Elcon 2000+ and I have been pretty happy with it. It was pretty cheap for a 110/220v charger and it has an automatic shut off and integrates with my BMS so if an HVC happens the charger will shutdown.
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