please don't give up on Hugo, could be an amazing emulator
The source code is now in the hands of a genius and he is also interested in a PC Engine emulator.
There isn't much that I can do than to say that games with a resolution lower than 320 pixels are centered on the screen. Games with a larger resolution aren't because it wasn't necessary to center it on the Dingoo A320 screen but these games also keep their larger resolution on the Dingoo A-380 so maybe it's possible to change the code so that all games are centered on the screen.
If this can be done than all other emulators from ZX-81 can probably be fixed for the Dingoo A-380.