Thanks for posting your findings. I have a Sony TV similar to @blockaboots and the supported signals are identical. I know that you posted the below on the fly but would you have proper suggestions on what to try for X3 or X4.
Console lines | 262 | 263 | x4 mode
H Samplerate | 1734 | 1727 |
H Active | 1280 | 1280 |
H Sync | 158 | 156 |
H Backporch | 198 | 196 |
As before, thank you for starting this thread and making suggestions.