I was afraid the MAX3353 might be NRND. Maxim doesn't make it too clear, but it was cut recently. For USB OTG to be supported long term, I'll need to swap in something like the STOTG04E. This may be a tough fit. I'll see what I can do, but it adds UART or i2c bridging support. I need to research D+/D- orientation. It may require changing out the USB connector and/or the TSU6721. The power supplies run well, I just need to pick a solution that doesn't get NRND'ed the second I finish the board.