I think I understand this a bit better. openwebrx seems to be an interface to the IQ streaming program rtl_sdr (or sometimes called rx_sdr)
Looking through this thread it looks like the device driver that is used (driver=sdrplay) is the original gr-osmosdr version that was written for the RSP1 and doesn't work very well.
If that is the case I would be surprised if it worked well for RSP1A or RSP2 as the front end switching will be different. Also, if that is the case then you won't be able to use the RSP1A or RSP2 features such as Bias-T, notch filters and port switching?
I would suggest 3 things that could make this better...
1. Use SoapySDR/SoapySDRPlay interface
2. Use the improved gr-osmosdr interface from Jeff Long (viewtopic.php?f=7&t=2881
3. If this application is just getting IQ data from rx_sdr, then someone can take the example code from our github repository and customise it specifically for this: https://github.com/SDRplay/examples