I agree seems like it is lifting too high, yard doesn't seem to be the trouble..Your land looks pretty flat. I have a ditch that if I'm not careful, will shove the mower up into the tractor. But it also causes the anti-scalp wheels to drag and dig along with the edge of the mower digging in. So you should notice if you have a spot similar to my ditch.
I'm kinda thinking out loud and trying to cover any and all bases so if someone else reads this thread having the same issue may also find the issue.
I still suspect your mower is lifting too high. How big is the gap in the height cam and the mid rock shaft at full lift? If that gap is larger than about 1/4", you're lifting too high.
View attachment 33521