With regards to the last flow image posted, that flow would work well but I think it would be difficult to achieve. The area of concer is circled in red in image 1 below. What I think the problem would be is illustrated with green arrows in image 2. I think the flow going out would pull the water in unwanted directions. As to fixing this, I think any added obstructions would cause the dead spots you are trying to eliminate, but there surely is a way.
