To deal with bottoming out, using Cherry Blue switches, I've found that these red dampeners work very nicely: http://www.amazon.com/gp/product/B00AZQ3966/ There are also thicker ones that have better stocking: http://www.amazon.com/Cherry-Rubber-O-Ring-Switch-Dampeners/... and the same company has a nice key puller: www.amazon.com/gp/product/B00AZCGF7K/
i bought the same orings (internal, external diameter. hardness) from a hardware store. paid $3.78.
...and you linked to the cheap ones :)
To deal with bottoming out, using Cherry Blue switches, I've found that these red dampeners work very nicely: http://www.amazon.com/gp/product/B00AZQ3966/ There are also thicker ones that have better stocking: http://www.amazon.com/Cherry-Rubber-O-Ring-Switch-Dampeners/... and the same company has a nice key puller: www.amazon.com/gp/product/B00AZCGF7K/