Oh, you actually have the P4A+ with built in screen, using only 2.4Ghz.Hi!
I do have the P4A Plus but since I’m talking about distance flying, I thought that the 5.8gHz part of the transmission signal was largely irrelevant. As far as I understood, the 5gHz signal was mainly for flying close by in congested WiFi areas as the 5gHz bands are usually a lot less congested!
No, 5.8Ghz works better in all conditions when compared to 2.4Ghz in the same P4P GL300F controller. I fly 5.8 AUTO exclusively, all the time, because it simply works better with longer range. You must have LOS connection though, no trees in the way, as 5.8Ghz doesn't have as good of penetration as 2.4Ghz.
You have only 2.4Ghz with P4A+, just like the P4, which is inherently weaker using that controller, unless DJI has somehow turned up the transmit power of that + RC in firmware. My GL300C was always weak with my P4, so I switched to the Inspire controller, GL658A which is compatible with with P4 craft, but has a stronger RC transmit signal, which is the craft's control signal.
Did my suggested settings help you any? I assume the + app in the system has these settings options.