User blog:Cat.ion0/Elgif dungeon results

The wiki says the catch rate of an Elgif at lv7 is 20%. But the probability seems much lower than that. I got 3 Elgifs (1 3* and 2 2*) after 8 runs on lv7 and 13 runs on lv5. This becomes a catch rate of 6.5% for lv5 and 8% for lv7, an average of 7.25%. I think. Out of these, the 3* one was useless (curse) and the other 2 were spark dmg boost and atk boost on full hp. So this is a 66% chance for useful Elgifs out of those captured. This becomes a 4.83333333% chance of useful Elgit? Please fix my math because I think something went wrong. What Elgifs did you guys get? How many out of these were useful? Comment your findings below!