Communication Range of DWM1000

Hi,

Now i test the range again with 0x1F1F1F1F power setting and disabled smart tx,
Communication range is
35m when data rate is 6800kbps
42m when data rate is 110kbps
There is something strange?
Do you have any idea?

Configurations:
Channel 5 (Question: when i configure receiver channel to 5, and transmitter channel to 1 or 4, they can communicate over different channels, is it possible or am i doing incorrect configurations?)
Prf DWT_PRF_16M,
preamble 3
preamble length DWT_PLEN_1024
pacsize DWT_PAC32
sfd 1
sfd timeout (1025 + 64 + 32)

Regards

Metin