Levels 21-24.What Pokémon are you catching. If you're getting a multitude of results it sounds like perhaps it's too low a level for getting anything reliable.
If you're seeing any of the results appearing across all of the trials, then it's quite possible those are the ones you're looking for, but obviously that requires tracking multiple possibilities at each reset, so meh.
Otherwise the process sounds fine (although why you're waiting a whole 1:20 before pressing {A} is a little odd, the faster you do it, the less time each turn takes... :)
You're right XD;; haha!