From your photos you appear to be a little bit nose high which CAN induce instability. It is usually preferred that if you can't be perfectly level then a little nose down is better. IN the for what it's worth area, integrated anti sway systems like Reese Duel Cam or Equalizer (if you prefer friction based) are both much better at eliminating the effects of bow wave and wind on the trailer. The friction bar, though SHOULD do an adequate job but is probably JUST within the specs for your trailer as they generally limit them to 25' trailer and under that length. You COULD just add a second friction bar but still would not be exerting as much force as a duel cam or equalizer would in keeping your rig straight and stable.
Good luck / Skip