@kingprawnsct, so I had to set “Allow TVP HPLL2x” to OFF, and “H-PLL Pre-Coast” AND “H-PLL Post-Coast” to 3 on the OSSC.
Line x3, x4, x5 all work on this TV. Although, I am using either NTSC consoles, or PAL consoles modded for 60hz. What cables are you using with the PS1? (no experience with Gamecube sorry).