The pumps usually have rubber shock mounts but if yours doesn't you can manufacture some of them and that will help. It also is probably connected directly to the PEX plumbing and causes that to vibrate. You can help that by installing some flexible connections between the pump and the water connections. To have it run less, install an accumulator tank on the output of the pump.I swear ours is mounted to a sounding board? How about pressure tanks to have it run less often?