Ok. I was having the same problem with hook up ratios a few weeks ago. A couple points:
1. First of all alot of times the fish doesn't always eat the toad. Sometimes they just smack it or just grab the legs. Only set the hook if you feel weight. You always have the chance of another strike if the you don't swing on a missed strike.
2. Braided line helps alot. It doesn't stretch at all and gives you a good solid hookset. I use twenty lb test but alot of other folks would reccomend higher.
3. I use 4/0 gammy EWG hooks and they work great. Personally I feel like a 5/0 is a little large even thought that's what zoom makes.
Just make sure your slack is gone before you set the hook.