I've recently been trying a new materia setup for Tifa for the oh so lovely Demons Gate to try and make it a bit safer. Elemental + Shiva to halve the damage of cave-in. Damage from cave-in drops to about 70-75 helping keep her alive when in critical HP.

I wouldn't think I'm the first person to try this, any thoughts on whether this is a good or bad tactic?

Thanks in advance