Hey Bluewave--I'm a visitor to thus forum, but, as someone in Baltimore who's been fringed by southern sliders since 2018-19 (eith Jan 2019 being the first time I remember that starting) your theory caught my attention. Areas in MD JUST south of me have done better in those kind of slightly suppressed systems, I've been wondering if this has just been dumb luck or whether something had actually changed!
So how do you think this would be a cause of that rather unusual theme (as ordinarily the northern half of the MA sub does better than the southern half).