Yuri-G, just do what I did, make a separate save for once your inside 'that place' since it's the point of no return, and just not worry about the whole 100%'ing thing. Blow all your currency inside that place on healing meds, and you're good to yawn throughout all the boss fights. At least you'll have 'beaten' the game.
(I did the same thing, stopped at that point in the game, and then two years later I decide to try it on my PS3, loaded up my old data....had a good two hours)
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