RF interference to amateur radio operations - Anyone have experience solving this?

My amateur radio station has suffered from high ambient noise in our home from day one, nearly six years ago. Z–wave has been in service in our home, also from day one. In the past few weeks, I finally put all else aside and went on a mission to find my problem, and have tumbled to the fact that the Leviton DZ15S in-wall switches are extremely high generators of RF interference. Has ANYONE researched and learned any useful lessons on this problem? I did not find where any of the other 23 Z-wave devices are interference generators, which is good. It is my hope to share my experience with others that may have the same problem and maybe not even know it, as well as to hopefully gain from the experience of others.

Beyond that, I wish you all a very Merry Christmas and a far better and Happy New Year!

PS: All of my testing so far has been in the 80M amateur radio band, which is from 3.5 MHz to 4.0 MHz.