What's a good iLvl to start CT/Coil?

[Ooshima]

Turn 5: lv 85 -all around-

85 for T5? Nope you can start doing at i80.

[Reishi]

T5 is in fact just a matter of practice and coordination. Hardly ever saw any pug down it, no matter iLv 80 or 90. While it is true that HP play some significant role, you can easily achieve that with food (though I'm no friend of just boosting HP with food as long as it doesn't benefit the stats important for your job). That said, I'll go with iLv 85 as minimum, too. However it depends on practice and ability more than any other fight in the game.