I have a couple of those 3 pole filters. I also special ordered some single pole 978Mhz UAT cavity filters.
They are great for a noisy location like NYC. I have 4 or 5 Mobile cells within a block or two.
Your stats look great. You will have the most A/C within a week.
This guy gets more position reports but could be in a better location
http://flightaware.com/adsb/stats/user/kq5m#stats-38787
You get 10 times as many reports at >200nm so I think you are doing pretty well.
Dave seems to get better reception to the East. Do you have something blocking that direction?
My suggestions, if any, would be
- optimise your gain settings
Tweaks - consider RF chokes on the USB pigtail(for the Prostickplus) if you use one and USB Power cable.
- put the RPI in a metal case to reduce noise getting into the dongle
- put the dongle in a metal case. I got some form https://www.rtl-sdr.com/buy-rtl-sdr-dvb-t-dongles/ however, they no longer sell them.
I think your setup is pretty much the best value for money. My radarcape only gets about 2-5% more planes than the Fa Prositckplus.