Understanding HDMI timings for a CRT (Kodi via Libreelec)

Hi there, serious newbie here looking for some help.

I've recently acquired a lovely Beovision 1 480i CRT which I use via RGB Scart as a retro media centre through Kodi/Libreelec.

Using the below config settings gets me a decent-ish picture, but I wonder if - with your help - I might do better?

Specifically, fiddling with the bottom line (hdmi timings) has got me some 'interesting' results. Is there more method than my current madness? What do the various numbers even mean (yep I'm that much of a newb)

Thanks so much for any assistance

dtoverlay=pwm-2chan,pin=18,func=2,pin2=19,func2=2

dtoverlay=rgb-pi

enable_dpi_lcd=1

display_default_lcd=1

dpi_output_format=6

dpi_group=2

dpi_mode=87

hdmi_timings=450 1 50 30 90 270 1 1 1 30 0 0 0 50 0 9600000 1

Hi guys. Hoping to resurrect this thread!

I've been happily watching my old anime via Kodi through LibreElec since I posted the above a year and a half ago. It's awesome and I love LibreElec :)))

The only (not so) issue I have is that higher quality video playback is often jerky owing to the Pi 3's lack of grunt.

To hopefully solve this I recently bought a 4b, installed LibreElec and was hoping to get it running via RGB-Pi on my CRT as a like-for-like swap out but I can't get it to display any kind of picture on my Beovision 1 480i CRT whatsoever.

Tried the same command lines from my Pi 3 LibreElect config etc. but nothing doing.

Any ideas please anyone? Has anybody got LibreElec running on a 480i CRT via an RGB scart cable like RGB-Pi?!

Thanks!