Hi, I've achieved 46.7mph. Can't seem to do any better due to GPS software. Any way to overcome this?

I've only had it a month, so just 45.8. But the P4P2 has been up to 47 mph. I think there was a strong tailwind on that one.  

29m/s with my mini2
https://app.airdata.com/share/MsURSf

You have to bypass the gps-speed limit. Very hard to do.
The only way I know is to send dumldore message and totaly bypass the SDK. Not the first hack you do.
That said, it might be other ways I don't know about.

For mavic2 the maxspeed in no no wind is 22m/s. Havnt got it higher than that.
In tail wind it's about the same as with my mini2, 29m/s. I guess it could go faster in strong wind, but I havnt tried yet.
I been focusing mostly on mini2 lately.

72,1Km/h here. But I am not interested in hig speed for what I am doing.