Fishing tips needed!?

Ok so every sunday me my 2 brothers and my dad go to a dock on Courthouse Lake in Minnesota to go fishing and have a bet for 100 bucks to see who can catch 20 sunfish first. The rules are you must use worms and can only use the lures and bobbers in the tackle box (Tons of different stuff in there ). I usually only have 4 fish by the time someone gets 20. Usually when I fish I use a regular Hook and a red and white bobber. The fish are really hungry there and you can see them in the water. When ever I fish The sunnys just steal the bait or when they get there mouth in the hook i yank up and they fall off. So i really need tips and strategy's for fishing these pumpkinseed sunfish. thanks