Slot sucks?

I've played through the first half of ROTDS... until now the only combinations i saw with Tifa are:
- The damn lucky bunny, which is the most frequent thing, it often makes fail even Beat Rush, which is the most common move, in vanilla 7-flush and Chocobop always connect if you get even just get the first symbol...
- Beat Rush, the most common Slot attack
- Waterkick, which is uncommon i make it when i'm lucky;
- Meteostrike(if i'm not wrong) is rare! the third move i saw it just 1 or 2 times!

And nothing else... why? what's the matter? does it depend on Tifa's level, or you have to manually stop in the right moment(in vanilla it should be almost automatic)
or what else?
It's a shame because I love Tifa, but i'm forced to say that she's useless in ROTDS...