@tonytoon I forgot to mention that the displays I have found are typically VGA, but many of them also have DVI ports. I found a cheap HDMI-to-DVI adapter which is the way to go. DVI cables are bulky, so this little adapter basically upgrades the display to HDMI. Also, I un-shell them and discard the plastic bezel. This sometimes requires me to relocate adjustment buttons which has not been a problem. You end up with a screw-mountable steel bracket reinforced screen with the driver board/power intact, just not all of the branded plastic.

@edmaul69 Yes, tried the game mode. Thanks!

I figured it out. In the Retropie menu, I had to go into Audio options and change the audio output from 3.5mm Stereo to HDMI because I went from using a PC monitor with the 3.5mm out to full HDMI A/V on my TV. Now FBA and everything else plays smooth and sounds fine.