Well, that's embarrassing.
First, thanks for the kind words about the thread. Just paying forward all the time, money, and effort I've saved through this board and the one for my former ride (xterraownersclub.com).
You're right, one of the ports is 2.1A and I tried it and got improved performance charging the iPad, but that was just one of the issues I had with the original port. I didn't spell all of it out in my revision for brevity but have now amended the original post as follows:
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Edited 12Dec16: Though one port provides 2.1A, turns out I need a more powerful option in practice, for example when traveling, when we have multiple devices to keep charged. Based on another member's recommendation, I am in the process of swapping in a
Blue Sea 1039 4.8A model. Some minor tailoring of the switch opening is necessary but I haven't done the install yet so more info on that will be coming soon along with my experience with the Blue Sea port.
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I'm also going to put the Blue Sea ports on their own Add-A-Circuit.