New QRPi Whispering Raspberry on 20M from FM03 ( Southport NC USA)

My new QRPi Whispering Raspberry is now on the air on 20M from FM03xw putting out a whopping 10mw into an attic-mounted MFJ 1788 loop.

My setup is transmit only -- and the recommended Linux TX command has it transmitting MOST Of the time, unlike my Windows 10/transceiver setup where it listens more then it squawks. The start command I'm using is "wspr -r -o -s N4NVG FM03xw 10 20M"

Are there any other Whispering Raspberry users (or Linux people) who use/recommend a different command having the system remain silent for at least a minute or two between transmissions?