I have rings, all colors, and landing pads (soft and firm ones).
I have found that the firm landing pads (grey ones from EliteKeyboards) are the best for reds. However for some reason, I have put soft ones (black) in my Filco. Wrong choice. I will have to fix that and put firm ones later.
I find that the O-rings, even the thick blue ones from WASD, let too much of the bottoming out shock go into the keyboard's chassis. The shock is then transmitted to the table. The firm landing pads do a slightly better job. I don't mind that the bottoming out feels softer than with O-rings.
The "weighted piano feel" I was talking about is more about the dynamics of the key press than the amount of force you need.
Grease creates a kind of slight drag on the switch stem, which makes it slightly harder to press without increasing the strength of the spring. If you press the switch slowly, there is no difference in weight with a non-greased one. It's when you hit the switch at "typing speed" that you can feel a difference.
When you press on a Cherry MX red switch, it just gives in. Your finger feels the shock with the key, but from then on its very linear.
Once greased, the feeling is different. When your finger hits the keycap there is initial resistance from the switch, which only then seems to give in easily. It gives the impression that the key has some weight that you first have to put in motion before it can continue almost by itself.
This, curiously, mimics the Topre dome collapse better than the tactile bump introduced in the MX browns and clear switches, which just feels scratchy. It also makes the switch much more silent, by eliminating most of the plastic clicks.
You can try this on a switch tester. You need one that allows you to remove the switches, so you can put two red switches side by side. Then you put grease in only one of them. The grease must go on the left and right of the stem, inside the switch housing. Then you can feel the difference between standard and greased reds. And you can also clearly hear the difference. The greased one does not click.
I'm well aware that putting grease inside a switch is risky business. I'm actually expecting some switches to stop working, but I have done that on 5 keyboards, the first one 2 years ago, and I'm still waiting for a single failure.
I cannot recommend the method yet, but it looks like it does not cause any trouble, and I'm fairly certain that in some switches the grease has reached every part of the inside of the switch, including the electrical contacts.
I'm currently using my Filco without grease, because I want to break it in for a while. Then I'll put grease, and replace the black (soft) landing pads with grey ones (firm).