A chance for you to prove your metal. They must have worked when new you would think.
So I would remove it, cut the face back till the seat was no more then lap in a new one with a new ball leaving the absolute minimum contact area.
Remember stilleto heels. They reckoned a seven stone woman wearing them exeterted more pressure on the floor than a forty ton elephants foot, well she would wouldnt she. So thats what you are after. The spring pressure remains the same but with a narrow contact area the lbs/inch rockets. Sorted.
Next question please.
Yours, Modest Bob.