Why let your characters in a lower level especially in Disc 1?
I let Squall be leval 20~30 but not above that. To do this you must learn GF Quezacotl's Card command. It turns monsters to cards, doesn't give you Exp but gives you more AP. thus GF abilities are learned first. I did it to Fastitocalon-F's near Balamb Garden. It's quite tedious though, I don't recommend it to impatient people. Then later in Disc two, try learning the Stat Bonus junction abilities, e.g. Str Bonus, Mag Bonus, etc. they give your characters a permanent boost by one point. BTW, if you want items such as HP Up, Str Up, Vit Up, etc, you would have to get GF Carbuncle, Tonberry, and Doomtrain. I managed to get Tonberry at Disc 2 cuz I want to have his Lvl Up/Down Command, it helps me lvl up faster or slower. When you're main characters are at least 50 and you are still in Disc 2, try going to Cetra Continent, in the forests near Kashkabald dessert. There are Ruby Dragons there that randomly appear. Once you are in Disc 3, I recommend leveling up in the two Islands. If you like the Challenge then go to Island closest to Heaven provided you have Pain, Sleep, Confuse, Berserk Magic junctioned to your Status Def. Don't say I didn't warn you... :magus: