Davidpritchard,
Yes -- each element covers a different aspect of SQ. Most of the time these various devices interact well together in my system. But not always. It is interesting that you could not get the Audio Magic PEAs to interact well with your IPC Acoustic Energizers. I was impressed with this product when I heard it a while back -- in a triangular configuration. But, after reading your observations, I am disinclined to add IPC products to my system because I have 3 Audio Magic PEAs and 2 Wave Stabilizers. My system is so sensitive at this point that one new element could throw the SQ out the window if it did not integrate well.
Yes -- this is all based on trial and error. Last night I changed the location and height of my Wave Stabilizers, with a big improvement in SQ as a result.