One comment; you're taking power from the 5v *analogue* supply. This is there to supply the analogue side of various chips and is not intended to drive digital circuitry - you may be inducing some noise into the analogue outputs from your digital board (though it will probably only be slight).

I suggest the other 5v jumpers (dual jumper pair) near the PSU inductors, which is the digital 5v supply.

Hugo