Jeff you are 100% correct. They are not symmetrical, I don't know what I was thinking since the frequency response swings up or down based on the side of the duplexer.
Here is a snapshot of the response when I put things back on the SA/TG. You'll see the insertion loss...
If I push the split up to 7Mhz, then its not bad. Its kind of like they designed this for a wider split but sold it as a 5 Mhz split.
