An update here on the flail mower. After doing a lot of searching on the web, I found someone else that had the exact same issues.
The Fix Is as follows:
1. After leveling the flail, set the top link to tilt the frame assembly back 15 degrees. This is the manufacturers recommendation.
2. On this flail, the back roller was fixed and after leveling and setting the tilt, the hammers were at a cutting height of 1.5”. The fix was to remove one of the two bolts on each end of the roller mount, pivot it down to a better height and drill a new mounting hole.
After doing these two things the flail sets up anywhere between 3 to 4.5” depending on where I set the stop point on the 3pt hitch.
I did a test run this evening setting up the 3pt stop for approximately 4”. I mowed along the edge of my driveway and a fairly rough woods area and it worked great.