Restrict Content Pro defaults its post metabox to high. It was displaying above custom meta boxes on my custom post types and well I can't have that. So here's the filter to bump it to low.

rcp-change-metabox-priority.php

<?php
/**
 * RCP metabox is higher than cpt metafields so
 * let's lower that priority a bit
 */
function chuck_rcp_chill_priority() {
	return 'low';
}
add_filter( 'rcp_metabox_priority', 'chuck_rcp_chill_priority' );