Just saw your video on the bucket binding issue Avel. The link is definitely too long. The reason it only happens at a certain range or boom height is when in a lower position the bucket hits the boom before the Z arm ( the link between the cylinders and the "dog bone" ) can travel beyond center.
The best way I can describe is ..... As you curl the bucket back the link is pulled straight back. Yours I see very well at the 4:20 minute mark, the link stops pulling straight back and starts to rise. Now when you boom down the bucket can't pivot and dump and binds.
Clear as mud?
To figure out proper link length I think you should calculate your length with boom in that trouble spot and be sure that it is still level or linear and not rising at end of stroke.
If you want to maintain new dump range, the only way to fix is a longer Z arm on the lower pivot point.
Congrats on a beautiful machine. Just the sound of the hydraulic system says Quality. Very nice., wish I had one.
Mario