Hello, in your last video we see that the Com7 is set to a speed of 19200 have you tried with faster speeds (38400 115200)?
You have too many useless frames try this config for rover. Note that it does not work if you have a radio link with the base roverortner.zip (3,8 Ko)
Configuration with radio communication : Improved konfiguration files for f9p with firmware 1.13 - #122 by CommonRail
Configuration Files - ArduSimple
We also see that there are very few visible satellites (GSV frame) what type of antenna do you have?