I couple of things you could try, if you haven't yet...
a) Reduce Air Speed (by half to start).
b) In QGC, enable re-transmission of actions/commands (see red outline in screenshot below). This is disabled by default, but can help a lot especially with param and mission upload.
c) Disable Mavlink in the 3DR Radio setup.
I also have one clone radio module (and 2 originals) and with the clone especially I found a combination of a) and b) to be most helpful (I forget the final air rate I was happy with, but it was decent). I have heard that c) can help, even though it seems counter-intuitive.
- qgc-serial-mavlink-retransmit.png (37.51 KiB) Viewed 28157 times
Cheers,
-Max