So, I moved the P2/PLM from the north side to the south side of the house, just above the electrical panel. My problem areas moved from the south to the north. Intermittent wireless commands from the palm pilot and poor response from light modules controlled by the P2/PLM. I tired moving my filters around and unplugging things, and then it hit me.
The south side is mostly the kitchen, and when last renovated I added some accent lighting consisting of LED modules and LED ropes. I had been so focused on wall warts.
I put one of my custom filters in series with the Led power plug, and now ALL my problems have gone.
Now, I just have to retrace my steps, and see which of the other filters are unnecessary.