In Strong Testimonials, redirect bad reviews to a different page.

bad-review-redirect.php

<?php
/**
 * Strong Testimonials | Bad review redirect.
 *
 * IMPORTANT! If adding this to your theme's functions.php, remove line 1: <?php
 *
 * For help, contact chris@strongplugins.com
 * 
 * @param $location
 * @param $status
 *
 * @return string
 */
function my_review_redirect( $location, $status ) {
  /*
   * -----------------
   * How to customize:
   * -----------------
   * Change these 3 settings that start with $my_ to match your situation.
   * Make sure words are in single quotes like 'this'.
   * Make sure each of those lines ends in a semicolon.
   */
    
	// Change 'rating' to the name of your star rating field.
	$my_rating_field = 'rating';

	// Change 5 to the rating value that defines a good review.
	// Values less than that number will redirect to a different page.
	$my_good_rating = 5;

	// Change 'feedback' to the slug of the page to redirect bad reviews to.
	$my_bad_review_page = 'feedback';

	if ( isset( $_POST['wpmtst_form_nonce'] ) && wp_verify_nonce( $_POST['wpmtst_form_nonce'], 'wpmtst_form_action' ) ) {
		if ( isset( $_POST[ $my_rating_field ] ) && $_POST[ $my_rating_field ] < $my_good_rating ) {
			return get_permalink( get_page_by_path( $my_bad_review_page ) );
		}
	}

	return $location;
}
add_filter( 'wp_redirect', 'my_review_redirect', 10, 2 );