I agree! It’s extremely difficult to discover the right h.samplerate for optim mode. The MVS optim settings have been discovered and are available here and they look great:
I tried to do Espgaluda by trial and error (no test pattern available on the PCB that I know of) and this was as close as I got but there is a wavy pattern through the background as it scrolls vertically:
Line5x mode 512×240 optim.
Sampling phase on the other hand doesn’t seem so difficult to do by trial and error.
I’m trying to figure out the right way to determine h.samplerate here: