Grand Piano Action Feels Heavy
I have a 7'6" grand piano that feels a little heavy to play. The keys aren't sticking or binding, they just require more force to press than other grands of the same model and brand.
With the grand, very light playing sometimes doesn't produce a note, whereas the other same model grand I tested responds much more easily to gentle touch.
Could this be high downweight, excessive action friction, or regulation? What should I check or measure first, and how can I safely make the action lighter and more responsive?