How do I unlock final GC rank?

[Bacongamer]

I have done Hardmode ifrit and Ampador keep, I cannot get passed Second Flame Lieutenant. I have also completed all 3 hunting logs

This was similar with the ranking system in FFXI. In the Wings of the Goddess expansion, you had a military rank that you also gained by points, and quests. But SE only added new ranks every-so-often to keep people from Start-Sprinting to the highest levels/ranks in the first days/weeks of the games launch. It's an obvious deliberate time wall to give us more to look forward too.