already wore out two sets of cutter blades on my renovator. Red clay, like concrete unless I break it every couple of years. The front is wonderful sandy loam, the very back is sugar sand. The middle is the devil"s bit with the hardest dang red clay I have ever seen. It will NOT grow anything unless you break it up often.
I have never tilted mine back like that to get the extra depth. But I really have to lengthen the top link on the hard pan, and loosen it a bit on the other. Because I run it over my coastal fields, the coulters are critical to keeping it from clogging so running nearly level has got to happen or it will foul up so thick that I will be a week digging out grass balls.
Nice pictures.. Bill