Wow it gets worse. I plugged in my Vita and left it overnight. (Powered off) Afterwards I turn it on and see it hasn't charged at all.
So I guess the problem had nothing to do with whether it is 1.0A or 2.0A. Rather, one of the charging ports on this dual USB charger just doesn't work!! The Vita was plugged in to the same port the PSP was. So I guess no matter what I plug in there, it won't charge.
Im not even entirely sure why I posted here in the first place but in the end it looks like my #chargegate runs deeper than I thought.
What do I even do now? I guess I will try switching the vita and tablet and see if now it causes the tablet to stop charging. I should also let the seller of this USB charger know that it doesn't work.
Edit: Damn, it charges my tablet just fine.
So I guess this whole time I just needed to find the right combination of which device goes in which port. O.o;