Best ways to increase the number of uses per day for a Bloodline ability?

[harmor]

Assuming you have already maximized your casting stat.

[Tirq]

Favored Class abilities for certain races add to this. None come to mind, at the moment. I'll post tomorrow with a full list, if someone doesn't do that before hand.

[Hawktitan]

Sorcerous Bloodstrike

[Xethik]

Robes of Arcane Heritage..? I'm not sure if this actually unlocks more as for whatever reason I'm thinking that they are based on your casting stat, only, and not Sorcerer level.

EDIT: Yeah, okay, just did a quick sweep and they are all based upon your casting stat, my bad.
My next best guess other than Bloodstrike/Favored Classes would be to take Eldritch Heritage in a bloodline that has a similar power.