Help help help.

Well, for me, EE just went down when I summoned the Magus sisters, and Yuna only had 9800 hp. I just kept the three a float and then had Sandy and Cindy attack (if they listened) and EE went down in about 10 minutes for me. My Yuna only has:


9800 hp
Nirvana CW
90 Strength
120 Magic/Def
55 Evasion
etc.

Okay, now I need to know something. Neslug, but don't stop there just yet, please!!!!

When I fight Neslug he goes into his shell within a matter of a minute or so. I take out around 1,200,000 hp very quickly. The only thing I don't have is Wakka's or Kimarhi's CW, but everyone else I have. The main problem I am encountering is not that I can't survive the fight, but that I can't inflict enough damage.

THIS IS WHY!! I think it's a glitch, because every Regen turn Neslug has, he gains 276,800 hp or 353,700 hp, NOT, 27,680, or 100, or 33,000. He gains almost 300,000 and sometimes 400,000 hp each turn I hit him. Even if I my Ultima Doublecast is perfect at 99,999 each time, it still isn't enough to do any damage. What is going on? My friend's game doesn't do that, he just recovers 100, 16,000 ish, and then 33,000 ish. But here, mine recovers nearly half a MILLION hp each turn!! I can't do enough damage for the life of me. After about 4 turns of trying to hit him, he comes right back out of his shell, and I start all over again.