Thaliss...tried, atleast?

With my mate...we did Amdapor/Wanderers for a few i55 gears to replace those he did not have, then move on to Pharos/Haukke/Copperbell for the i60 pieces. During this you will be gaining Phil (Myth now?), and at around i55 can do Ifrit for his wepon (While starting your jobs relic). Once confident complete Garuda/Titan HM, for progression, relic and/or weapon drop.

Once you've received a primal weapon / relic, venture into Brayflox/ Halitali / Amdapor 2 for i70 drops, and i90 tomes. You can also participate in Crystal Tower which drops i80 in an alliance setting.

This will end you at i90, gathering i100 (Soldier....yes, i know) tomes with everyone else.