Did you rename the ELFs to have standard Sony-style filenames (XXXX_XXX.XX)? If not then you'll need to use the function of newer OPL builds that lets you set the ELF name, and rename the ISO to have a fake one prefixing the title. So, for example, you can either rename the SNES Station ELF to something like SNES_EMU.01, adjust the SYSTEM.CNF to match, and remaster the ISO, making sure to also name your ISO SNES_EMU.01.SNES Station.iso - or you can leave it as is, name your ISO as listed above, then set OPL to use the actual ELF name.
Chip-free/MC-free homebrew <3
FMCB 1.93 on MC for emergencies, NA
250GB HDD/FHDB 1.93/OPL 0.9.2 (GSM and non-GSM)/PS2 games, NO HDDOSD
80GB HDD/FHDB 1.93/POPStarter rev12/OPL644/GSM0.37/PS1 games, NO HDDOSD
SCPH-75001 (sitting idle, slims suck):
FMCB 1.92 on MC