Someone named 'Patricio'
has a kernel for your tablet. You didn't say you needed that, but if they are working with your tablet at that level of complexity, this might be a source to find out why your ROM won't 'stick' after flashing.
There's also someone else,
from Chile, working with your tablet's firmware. He also should know how to make your ROM flash 'stick'.
This may or may not apply to AOC tablets, but with the non-branded phone imports, it has been known for a manufacturer to keep the same model name but make hardware changes on later production runs. If you get an expert's flashing instructions and it still doesn't work, then look for internal identification numbers and see if that matches with the ROM's source.
As you may know, that match has to be 100% or the firmware won't work after flashing.