Disregard, I atleast have it figured out for now. I copied the theme-styles.php file to the child theme and then searched for;
if ( is_page_template('page-landing.php') || is_page_template('page-alt-home.php') ) {
$layout = "Full-Width";
global $solostream_options;
$solostream_options['solostream_layout'] = $layout;
and added the following right below it…
if ( is_bbpress() ) {
$layout = "Full-Width";
global $solostream_options;
$solostream_options['solostream_layout'] = $layout;
}