try this
//*** make Services full col ***/
add_filter( 'body_class', 'custom_post_full_width', 999, 2 );
function custom_post_full_width( $wp_classes, $class ) {
if ( is_post_type_archive('services') OR is_singular('services') ) {
// List of the only WP generated classes that are not allowed
$blacklist = array('two-col-right', 'two-col-right-1080');
// Blacklist result
$wp_classes = array_diff( $wp_classes, $blacklist );
// Extra classes to add
$wp_classes = array_merge( $wp_classes, array('one-col','one-col-1080') );
}
// Add the extra classes back untouched
return $wp_classes;
}