I know there has been debate on whether the LG290P Quectel’s are compatible with 57600 baud but now the RTK Everywhere v2.3 says that 57600 is out of range. You can only have 9600 or 115200 (or higher).
The only thing I have found for the airspeed to stick is to change the underlying parameters - bandwidth, coding rate, spreadfactor, RxToTxUsec, Heartbeattimeout. When these are changed (and you enter the commands ATW, ATO), it will change them permanently even after a power cycle.
Unfortunately these changes, plus others like turning of encryption, turning off frequency hops to try and make the comms as fast and as robust as possible has not helped. I still can’t good enough communication between my Base and Rover to get RTK-Fix.
For anyone who has, I’d love to see what you have your settings as I’ve tried everything I’m aware of (detailed in this thread)