Bug-O:
Nice photos and video. Looks like you know your stuff. However, to educate the group here, perhaps tell us the hours you might estimate that you have run with diff-lock engaged. That might answer the question of how long it can be run that way with all the rough ground there. Be sure to let us know if it ever fails and at how many engaged hours total. It might be an indication that orange is pretty tough after all.
Out of curiosity, with that bucket full as front ballast, can you tell if, with a load of logs hung as high as you do, has the front end ever come off the ground? In my snaking of logs with a smaller tractor, I was always watching for that possibility, especially going up hill. Even with ROP, I was not that sure. The load in the bucket is good. I shudda thought of that.
Again, don't worry about comments from those not in your shoes. Your info was good.