Disc 9 is indeed at the bottom of the ramp (right behind where you first warp in) in the Dulk Fakis route.
For the Bruce's Dungeon route, the first disc is in the room where you get the first key. It appears in the back of the room after you kill all of the enemies in there. The second disc is right near the end of the block, where you hit the holographic... console... thing, to open the final door. Opposite the console is a rock wall which you can walk through to find the disc.
Unless I'm crazy, I think you can get the Bruce's Dungeon route with and without rare enemies in both the De Ragan/Ragnus and Adahna/Dimma paths.
Nit-picky thing: in the De Ragan/Ragnus path, you're in the Raffon Relics, not the Agata Relics. Orgdus, as well as the non-yellow-coloured background, gives it away.
Lastly: all the remaining drops that you're unsure of can be found here: http://psupedia.info/The_Protectors_%CE%B1 I think what you have so far is correct.
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