ok guys i am a newbie in FF7 ( in English as well O:] ) Well I gave her Premium Heart ok before that she (lvl49) used God hand and did about 1500 damage . But with her ULTIMATE weapon on , she did ... around 150 damage all the time . I was ... WTF T_T :-( :erm:
so can you explain me why please ? Do i have to level her more or power up her weapon before using it ?
Thanks a lot .

If you miss using one of your limits, the weapon power will go up, so use as much limits with Tifa as you can and try to land on miss even more and you should see a considerable increase in attack power.

(This applies to Tifa only using her slots to land hits/misses.)

Another thing I noticed is that the fuller her Limit Meter is, the more power.