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Yes, there is a parasitic draw when batteries are in parallel, but it's not drastic, and the AGMs would handle it better (lower internal resistance). Taking away 1/2 your battery capacity to get rid of it is a really silly solution. If it bothers you that much, adding an isolator...

In short, what you did is worse in almost every measurable way, electrically. It will probably be good enough for your needs, since the system is admittedly overkill to begin with, but hopefully people don't read your post and think "That guy said the 12V drop was bad, so I need to mimic his...

You met your original goal of "wanting to get rid of the 12V drop", but that goal wasn't an improvement (besides using COtS batteries, which would have been electrically better with 4, or even 2). Can you explain why the "12V drop" is an issue?

That doesn't seem like a very good idea. Can you explain more?

Where do you buy blemished batteries? (And who is so picky about their batteries that they would pay more for perfectly unblemished batteries?)

There should be a diagram inside the lid, if they left it.