I throw the Bull Ribbits quite a bit and find a 5/0-6/0 Superline EWG skin hooked with braid works the best.
As far as hook up ratio, sometimes the fish hit it so hard all you have to do is lean back and apply pressure, when they slurp it down you may have to wait and feel the weight before setting the hook. If new to frog fishing, try and look somewhere else when retrieving the bait so you don't jerk it away from the fish. May sound dumb but it helps until you get used to the pause.