My problem is simple. I’ve noticed that weight paint doesn’t work in “gradient” manner anymore. For me it’s only value 1 or 0. What I mean by writing this is even if I paint part of surface with green, and other part with red they are equal to each other.
All vertex weights are internally normalized. Thus, if a vertex is assigned only to a single bone, its weight is irrelevant (as long as it is > 0). You should see the difference assigning those vertices to more than one bone.