Let's get down to basics, so everyone is on level ground here:

At level 71 and beyond, the game will no longer decide your stats for you upon leveling up. Once you hit Lv71, your currently equipped augments will determine your stat increases (not counting your Auto command, or Item, since it cannot be removed in the first place). This means that, in order to effectively raise your stats right, you gotta have a right proper build for it, and work your magic from there.

Now, moving on, is the augments that are required for this setup, and who must get them; I will not be making a full-on augment guide, so as long as you have the augments you need, I'm not really worried about extraneous variables. Use what works best after maxing your stats.

The augments should be distributed as follows:

`Limit Break x1 | Cecil `

Omnicasting x2 | Cecil | Rosa

Gil Farmer x1 .| Cecil |

Twincast x2 . .| Cecil | Rosa

Whirlwind x3 . | Kain. | Rydia | Edge

Tsunami x2 . . | Kain. | Edge

Inferno x3 . . | Kain. | Rydia | Rosa

PiercingMagicx1| Kain

Phoenix x3 . . | Kain. | Rydia | Edge

Last Stand x1. | Rydia

Curse x2 . . . | Rydia | Edge

Bardsong x2 . .| Rydia | Rosa

[Cecil]'s Love | Rosa [it's Rosa, so "Cecil" works]

Bless x1 . . . | Edge

Now, I'm not really going to get into any technical BS, so if you wanna know EXACTLY by how much each augment raising stats, then look them up in a guide, or do the math from my numbers. I will not be mentioning raising HP or MP, so I will not even bother listing their increases from these augments.

Now, on to the leveling charts, the meat of the math! Follow these charts, equip what's listed for the right level, and get your stats maxed the right way!

Cecil:

1) Limit Break Lv71-99 (+29 to all)

2) Omnicasting Lv71-99 (+29 INT/SPT)

3) Gil Farmer Lv71-99 (+29 SPD)

4) Twincast Lv71-75 (+5 INT)

`Cecil Lv70 | 1) | 2) | 3) | 4) `

...STR: 73 | 99 | -- | -- | 99 |

...SPD: 41 | 70 | 70 | 99 | 99 |

...STA: 70 | 99 | -- | -- | 99 |

...INT: 36 | 65 | 94 | 94 | 99 |

...SPT: 41 | 70 | 99 | -- | 99 |

Kain:

1) Whirlwind Lv71-99 (+29 SPD/INT/SPT)

2) Tsunami Lv71-99 (+29 STR/STA/INT)

3) Piercing Magic Lv71-99 (+29 INT/SPT)

4) Inferno Lv71-86 (+16 STR/SPD/STA)

5) Phoenix Lv87 (+2 SPT)

`Kain Lv70: | 1) | 2) | 3) | 4) | 5) `

...STR: 71 | 71 | 99 | -- | -- | 99 |

...SPD: 54 | 83 | 83 | 83 | 99 | 99 |

...STA: 56 | 56 | 85 | 85 | 99 | 99 |

...INT: 12 | 41 | 70 | 99 | -- | 99 |

...SPT: 39 | 68 | 68 | 97 | 97 | 99 |

Rydia:

1) Inferno Lv71-99 (+29 STR/SPD/STA)

2) Whirlwind Lv71-99 (+29 SPD/INT/SPT)

3) Last Stand Lv71-99 (+29 STR/STA)

4) Curse Lv71-77 (+7 STR/STA/SPT)

5) Phoenix Lv78-82 (+10 SPT)

6) Bardsong Lv83-90 (+8 SPD)

`Rydia Lv70 | 1) | 2) | 3) | 4) | 5) | 6) `

...STR: 36 | 65 | 65 | 94 | 99 | -- | 99 |

...SPD: 33 | 62 | 91 | 91 | 91 | 91 | 99 |

...STA: 34 | 63 | 63 | 92 | 99 | -- | 99 |

...INT: 72 | 72 | 99 | -- | -- | -- | 99 |

...SPT: 54 | 54 | 83 | 83 | 90 | 99 | 99 |

Rosa:

1) Cecil's Love Lv71-99 (+29 ALL)

2) Inferno Lv71-99 (+29 STR/SPD/STA)

3) Omnicasting Lv71-99 (+29 INT/SPT)

4) Twincast Lv71-89 (+19 INT)

5) Bardsong Lv90-98 (+9 SPD)

`Rosa Lv70: | 1) | 2) | 3) | 4) | 5)`

...STR: 48 | 77 | 99 | -- | -- | 99 |

...SPD: 32 | 61 | 90 | 90 | 90 | 99 |

...STA: 42 | 71 | 99 | -- | -- | 99 |

...INT: 22 | 51 | 51 | 80 | 99 | 99 |

...SPT: 73 | 99 | -- | -- | -- | 99 |

*continued below*