As things stand with the tolerance range you could actually end up with looser hinges buying the new 4Kg hinges
3.3kg hinge = 2.8kg-3.8kg range, 4kg hinge = 3.5kg-4.5kg range, the floor is 3.5kg which is 700g more.
I rather wait for a redesign with lower tolerances and perhaps adjustable, these hinges will only get looser over time and mine are on the low end of acceptable currently…