I find it interesting that you mention QSB on the QO-100 beacon signals - and I have heard that commented before. Can you specify how much QSB you see? Like many others I also use the beacon signals for checking my setup, making ajustments, improvements etc., But I find the signals quite stable with variations less that half a decibel or so. (I have ofcourse seen greater variatinon during very heavy rain, but that is not something that happends often)
Maybe we could find a time on the satellite to exchange observations?
73 Ole OZ2OE