All's I know is this...and I am getting this from St. Augustine himself. We know that BOTH God is sovereign AND that the will is free. That we are judged by our actions, even though we cannot act save by the grace of God.
This is what St. Augustine taught; this is the Catholic and Apostolic faith.
See Letter 214 and Letter 215 to Valentinus.
I think I just postred some of his teachings.
We are on the same track.