Hi Pavel,
That sounds a little short - what kind of configuration are you using (number of slaves, number of audio channel, streaming format, latency etc. )
If you have access to our CC85XXDK you can do a side by side comparison.
If you have access to a spectrum analyzer you can test the output from your board using the PurePath Wireless Commander tool (set a continuous carrier): http://www.ti.com/tool/purepath-wl-cmd
Regards,
Kjetil