Correction for your guide...
L66 is 88,000
L69 is 100,000
I corrected the Data Sheet 2 weeks ago when I noticed the error. From L64 to L69, each level increases by 4,000 per 4 slots.
Also, in the "What is a + armour" section, you could add this:
Level 30 armors require enhancement to level 10 to unlock +
Level 50 armors require enhancement to Level 15 to unlock +
Level 70 armors (story/non epic) require enhancement to Level 25 to unlock +
Level 70 armors (epic/boss) require enhancement to Level 35 to unlock +