try
--gain -10 --freq-correction 0
Might improve things a bit.
Mostly your reception is bad, most likely related to your antenna and antenna position.
For a start you could read this thread: Three Easy DIY Antennas for Beginners
Apart from that if you don’t have a clear line of sight to the aircraft you probably can’t receive it.
So buildings and trees block reception.
For good reception the antenna needs to be on the very top of a building.
Or if placed in a window you will only have good reception in one direction.
But if other buildings are higher then reception will still be poor.