115,200 bauds RF Data rate on XTP9B-DPS-001 modules

XBee & XBee Gateway
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1

Hello

We connected two XTP9B-DPS-001 modules with coaxial cable and attenuation of 40 dBm.
Power Level is 21.5 dBm (PL=0).
We work in streaming mode with transmissions never acknowledged (RR=0).
We have no problem with the 9600 bauds RF Data rate.
We are losing a lot of message when we work with 115,200 bauds RF Data rate.
To have a safe transmission we use the parameter Multi-transmit MT=5, but our transmissions are now too slow.
We tried unsuccessfully linear power supplies.
Some ideas about our problem ?

Thanks & Regards