Chynna Phillips is having a hard time picking and choosing which battles to fight in her rocky marriage to Billy Baldwin. In a video shared to her “California Preachin'” YouTube channel on Monday, April 22, the 56-year-old opened up about struggles she and the Gossip Girl actor continue to face almost 30 years after tying the knot in 1995. “[It’s] frustrating because just when I feel like we’re on a roll and things are starting to get better, we start the bickering again,” Phillips admitted of the couple — whose problems seemed to occur following their recent cross-country move back to the Wes…