@IsuckatHAX Which site are you referring to - I'm assuming this site? Or maybe the
PS2 CONFIG Database courtesy of aldostools?
It should be the same as the software-based PS2 Classics emulator config files - but someone please correct me if I'm wrong. I'm not sure what you did to get configs working on your slim, but the way I have done it is as follows:
Download the relevant config file for the game, so the relevant title ID and type (GX) and then rename from the title ID to what your ISO is titled (see below) and place it in the same folder as the ISO (PS2ISO). For example:
Ratchet & Clank.iso
Ratchet & Clank.iso.CONFIG
Not sure if you tried this already as you didn't provide many details, but this should apply the CONFIG provided it's the relevant title ID and type. This works for the PS2 Classics/ps2netemu CONFIG files, and so the principal should be the same. Again, I stand to be corrected as I've only ever used the software ones for my own slim console. Hope this helps.