It's never a bad idea to do a double keystab setup (unless you can do a different combo that can kill them, durr); at the very least, you're resetting your knockdown gauge and keeping her bloodpacks protected. By the same token, if you're still sitting comfy with 3 bloodpacks, it might be wiser to pocket the tension. As Furix said,
The more you play, the more you'll find ways to spend your tension. Furix mentioned the force breaks; FB Danzai, with the amount of damage you can get for the price you're paying (25% tension, maybe some damage, little risk), is just sick; landing the blockstun on an FB Fireball is either a forced mixup or a pressure restart + guard gauge lols in your favor, and FB Slide in normal mode is an excellent buff for normal mode from /.
In addition to what Furix said, you've got the standard Roman Canel. You can mess around with RCing Danzais, Rekkas for pressure restarts, Houshokus (Butt), and, of course, the unblockable.