PTP SXT LITE 5 AC low speed

I’m having trouble making an ptp link. of about 400 m with direct vision. The most I’ve got of speed would be:

21Mbs of point A -B
31Mbs from point B-A

I leave the configuration files if you see something strange …

thank you
ptpB.rsc (2.35 KB)
PTPA.rsc (1.63 KB)