That could be a change in weather conditions actually.
You could always swap back to the SDR and see if range goes back up.
Also if the pi3 has sufficient cooling you should be able to run more than -e 9 at 12 MSPS sample rate.
It’s easiest to just add -C 75 or something if you don’t have temperature issues and a good power supply.
It’ll use most of what the pi3 can do.
But usually changing -e won’t affect max range really.
I’m not sure the autogain is the best option for you.
Maybe try a fixed gain of 19 for a bit?
What did you do Saturday afternoon, that looks like a detrimental change … looking at the RSSI.