1/2. It was stated that that the N64 was tested after Modification was done. Since those Pixel Color and Cable Issues arent that apparent if you boot up a game for a few seconds it was probably overlooked. I will get into contact with the Modder and will ask about those technical specifications you stated. Updates follow as soon as there is an answer.
3. Still a black screen even with v.backporch down to 15. Maybe my Samsung is a bit picky when it comes to resolutions.