What's expected FPS for Spotlight battery cam and Doorbell 2

I found both my Ring devices have poor video quality. As a result, it is very difficult to tell the details, such as people's face or car licence plate.**Spolitlight battery cam:**15 FPS, bit rate: 800~900Kbps, RSSI: -60**Doorbell 2:**15 FPS, bit rate: 800~900Kbp, RSSI: -46My home internet is Download:500Mbps and **Upload:20Mbps **Questions:1. What's the expected FPS for Soptlight cam battery and Doorbell 2? 15 or 30 FPS?(PS. I know floodlight cam is 15FPS)2. The RSSI is between -46~-60, which is good. but why the bit rate is still so low?