What is the current hp of your characters? I have to do missions 59-64 but i'm maxing out my weapons and characters before i do.

Lightning = 17345 HP, 1669 Str, 1690 Mag

Fang = 21395 HP, 2091 Str, 1246 Mag

Hope = 15445 HP, 975 Str, 2240 Mag

All with Lvl * Tier 1 weapons, excluding Lightning who has Ultima Weapon Lvl 30 (tier 2) and General Belts Lvl *.

Mission 63 you can use the Death trick.

I am maxing out aswel, and 5/5s'ing everything which is being a pain without the Gold Watch, currently have 4/6 of Roles Lvl 5 for all characters so may try mission 62 again and then mission 64 and i will have done them all :D

what about you?

The Ratjavikias are indeed powerful, but you can even the odds in your favour. Just make one or two Witch Bracelets * per character. That way you'll have almost 50% magic reduction, which trust me, will make all the difference in the fight XD

The trick to the fight is to single each one individually, forget about the other one. Use lightining as your Main, and start with a SYN/SAB/SAB paradigm. Buff with Haste+Shell first and then with Protect+Bravery/Faith(as you use each character), and then switch to RAV/RAV/RAV. Make sure the Ratjiavikia is slowed, deshelled and Imperiled, as this are of the utmost importance.

Once Staggered, use Army of One until you boost the stagger bar to 800%, then switch to COM/COM/RAV to finish him off. With your stats, you shouldn't have a problem finishing the first ratjavikia on the first stagger. Just make sure to be fast, unless he will put up Inertialess Barrier and you'll lose that stagger.

Rinse and repeat for the next one. Use a MED/MED/MED paradigm for mega fast healing should you need it. 

all characters have hp of around 21,000. I have Kains Lance for Fang (tier 3) at lvl 59, her strength is 2739. Light have omega weapon (tier 3) lvl 56, her strength is somewhere around 2500. Everyone else has a tier 2 weapon. I have power gloves and platinum bangles.

Any tips for the giant cactuar? I need to do it again to get 5 stars

Christ! I hope on the second, he's basically a big wall of heads that I have to chip away the side heads first, then when you get to the middle head he's buffed himself so high I can't hurt him enough and then, boom, doom counter. I was soooooo pissed.

Any advice?

Make a Random: Instant Stagger Synthetized Ability, it's made by combining either of these weapons:

Hauteclaire, Durandal, Lionheart, Ultima weapon, Rigels, Polaris Specials, Procyons, Betelgeuse Customs, Unsetting Sun, Midnight Sun, Alicanto, Caladrius, Heavenly Axis, Abraxas, Taming Pole, Venus gospel.

With the accesories: Survivalist Catalog, Hunter's Friend, Speed Sash, Energy Sash and Champion's Badge.

This works on the same % that Death works, but the upside is that you can instantly break any enemy. I used Lightning with Ultima Weapon and Survivalist Catalog equipped and made her my main. Snow with two General Belt * and as a SEN, Vanille as a MED and Lightning as a COM, until I staggered him with the Instant Stagger ability. It may take a few tries, but eventually you'll hit him in the first seconds of the fight with it.  

Of course I have none of those weapons lol but I do have speed/energy sash and a survivalist catalog. Thanks

Mission 64, is, a, BITCH!

You can buy any of those. The Lionheart would be my better pick, it's sold on Plautus Workshop for 28K. 

OT - How come so many people have trouble with mission 64? Vercingetorix was pretty easy.