i know that landing pads were mentioned here, but I think it was in the context of Topre switch. You might also consider using EliteKeyboard's landing pads on your MX board. I've tried both o-rings and pads and prefer the pads, just because it seems the keypress impact is softer, albeit "mushier".
I have some laying around and can send you some if you'd like so you can test. I have the "soft" black landing pads from EK, not the "firm" white ones.