Um, I always use GFs for fights. You will have to heal a lot if you have low levels. (Does 13, 14, and 16 seem low to you?). You could always have high levels, and have Thunder magics. Like Thunder, Thundara, Thundaga. That would be really easy. I also found it that if you GFs in every fight, and fight a lot, you will level up faster. My mom is like on level 60 something and all of her GFs do 9999. Of course she only has Shiva, Q dude, Ifrit, and the the Brothers, but she's doing good. Shes on level 51 on Disk 2! Thats what I call leveling up. But yeah, that'll help a lot.