A suggestion on the CR10 facebook group lead me to foam practice golf balls to dampen the vibrations of the printer to the floor.
These things are great. They pretty much stop the vibrations.
I might add another version that allows the CR-10 to absorb vibrations more in the Y direction, as the mass of that entire large build plate is way larger than the little X carriage, thus creates more vibrations.
You might need to reduce the triangle count if your printer seems to be going slower than usual on the arcs.