I don't have a vex or a Aqua-Vu but when I know that a fish is there (getting small taps) but don't commit, I will lift my jigging rap real fast and hang in about 3-4 feet above the head of the fish, then pause. Then a wiggle-wiggle and then pause. Gives it that fleeting bait-fish look and usually, if I was getting small taps, the fish will commit, sometimes by crushing it. I do this often even when I am not getting taps.
As mentioned before though, the pauses are real important.
Manny