I clicked through all the stickies but I was not able to find the thread/post you are referring to. I must be missing something. Can you give me a link?
The Trinitron displays my classic consoles fantastically: Atari, NES, SNES, N64, Genesis, etc. Actually, using the NTSC preset, most of the modellines look fine. Not sure what I was doing before. On some of them (like 640x480 interlaced) the image bounces up and down depending on what's being displayed. If it's mostly dark, no bounce at all. If it has some colors, it bounces occasionally. If it's mostly light, it bounces a lot. Some modelines bounce more drastically than others. On all of them the image is slightly too large and offset to the right.
Originally I started with the "Sony PVM" preset. Most of the modelines displayed fine with no bouncing (including 640x480i). I was using Arcade OSD to edit the modelines individually because they were all offset to the top right, but I realized there were a lot of modelines and the docs specifically say it's better to adjust your crt_range/monitor_specs line and regen the modelines.