I should probably just tell you that i did order and received the 2x Tomee NES to USB adapter. They work flawlessly with my two original NES-004E controllers. I have been using them for the past 2 weeks playing top NES games. :-)
I am still waiting for the PSX to USB adapter to arrive. At the moment i have no way of testing my PSX Analog controller.
Turns out it was my charger all along . Here is what I ended up doing.
From my Pi3 I run a DC Barrel Jack to Micro-USB B Male Connector (http://a.co/d/4yVdU3c) . Then from the barrel jack I have a normal power supply (http://a.co/d/7j0vMr3) . No voltage issues at all and everything seems fine.
@xd3l Turns out that I can't use any of my USB hubs with this. If I do, the Tomee Adapter doesn't pick up, though everything else does. If I take the hub out of the equation then the NES adapter works every time without issue. This is unfortunate because I was hoping to rig up a player 2 port, thus needing a USB hub.