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I can't really answer your direct question, but I do have a couple thoughts
first thing I'd do is look more closely at that back-up camera display. that no doubt eats a lot. I found that mine (mine is the dash radio) had a very cryptic way of putting the display off. I'm guessing yours probably does have a way...
The other thing...when you say you charge to 12.9-13V, that probably isn't the most reliable way to look at state of charge. As I understand it, to get a battery level status using voltage it has to rest for some time after charging because of surface charge and such throwing off the reading.... and that it takes a really long time to get those last few amps into a battery... so my point is maybe you're not getting the things fully charged and so it's stair stepping down lower and lower day after day.
I don't have any personal experience, but I understand that folks that get seriously into this stuff, use battery monitors that more accurately track amps in and amps out
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