I have a 2016 L4701 and a 2020 Grand L6060. The joystick on the L4701 will feather the bucket to maintain level whether I’m raising or lowering. The L6060 doesn’t do that. Is there a difference between valves on these tractors?
Might be an extra setting on the L6060 that is interfering with your control. I'd look at that. AFAIK, all Kubotas are capable of that functionality. In any case, a Grand L should have more features, not less.