Mark,
I too welcome the opportunity to compare methods and results. What is your location? I am in Hayfield in the Peak District. Here is my colour chart from one of the systems.
Filtering non-meteor events from the logged data is a tricky one; I select and reject using calculated characteristics of each event. For this system over 30% were rejected or which many were probably meteors.
I think one reason I may have relatively high count rates is because the FFT in the capture and logging program provides higher resolution in time (~10ms) rather than in frequency; this detects shorter duration meteors than, say, Spectrum Lab set-ups normally do.
The antennas in the vertical configuration do not utilse the maximum gain; I has mast head LNAs to provide a little boost to the signals.
Mike