looks like you are using a modified version of what I call Vertical Casting .... have you tried using a 1/32oz or 1/16oz hair/marabou jig, and doing the same thing ??
The fact that you are using a #7 sinker, would mean that the minnow would probably be falling slowly ... giving the impression of a dying or injured baitfish - good tactic !! And it's probably the reason for getting "hits on the fall". The slow rising retrieve imitates much the same, and presents an easy meal (slow moving escapee) ... plus, it rises thru the zone, where the fish are suspending, and stays in that zone long enough for the fish to see it and react to it.
Congrats on a fine catch .......... luck2ya ....cp