Haz ... here's my input/opinion.
1. Your grass looks fairly thick. Bare minimum cutting height should be 3 inches.
Regardless of what type of blades you use, rear discharge will always leave a windrow, the kind you have come to despise, unless you are cutting less than 1/2 inch of height.
That being said, you will be undoubtedly be much more satisfied with:
1. A right (or left) side discharge deck. This way, you can cut in a clock wise motion, or make as many right turns as you can, and keep moving the cuttings dumps into one or 2 rows. I've found that I can go back over this row or 2 with the deck up and blow those rows out of eye sight also.
2. Sweep or vaccuum your cuttings. I know plenty of people that do this and in my opinion, it is a drastic time increaser, and maintenance chore I'd rather do without. Sweeping after cutting adds unnecessary hours onto our machines. Stopping to empty grass hoppers every 15 minutes also becomes inefficient and a PITA.
Our grass likes the clippings, but not in volumes that suffocate and kill.
For my region, those first few May months when grass is growing an inch a day makes it impossible to have a clean cut without raking, sweeping or vacumming at least a little unless you have the time to mow 2 or 3 times a week-which I certainly don't.