OK! So, to summarize the True End requirements:
1: View all seven scenes on Floor 10 (Sadist, Masochist, Bipolar, Terse, Graceful, Hyper, Ditz). Requires 5% Charm with each Affinity. This must be done BEFORE COMPLETING CHAPTER 7.
2: View all six scenes on Floor 30 (Sadist, Masochist, Terse, Graceful, Hyper, Ditz). Unknown Charm requirement. Best guess would be 10% for each Affinity, given the seeming pattern.
3: View all seven scenes on Floor 60 (Sadist, Masochist, Terse, Graceful, Hyper, Ditz, Bipolar). 15% Charm required with each Affinity.
Steps two and three MUST be completed in CHAPTER 13, BEFORE going to Ivory World.
Proof of being locked onto True Path: Mugen Emblem on the balcony in G-Castle, resulting in fight with Sun Goddess and Ultimate Weapon. Ace's Level at 125 instead of 95.
Sound about right?