Pre Render a Taxonomy Checlist, then update post

I am having trouble populating a checklist with the checked values of a post, and then update the terms after submission. The post being edited is sent to the form by query string, and I did fine getting the name and values for the taxonomy in the form. However, everything I have tried for checking boxes and the setting post terms hasn't worked, wondering if anyone knows what I am doing wrong?

Here is the pre-render with just the taxonomy and values, I tried using, wp_get_post_terms and differnt ways to get the checked values in, but couldn't

add_filter('gform_pre_render_2', 'populate_each_product');
function populate_each_product ($form){
global $post, $wpdb;
$id = $_GET['kr_id'];
if(!empty($id)){
        foreach($form["fields"] as &$field){
            if($field["id"] == 3){
            	$args = array( 'hide_empty' => false, );
            	$cats = get_terms('product_category', $args);
            	$field['choices'] = array();
            	foreach ($cats as $cat){
			 $name =  $cat -> name;
			 $val =  $cat -> term_id;
        	         $field['choices'][] = array( 'text' => $name,'value' => $val);
                }
            }
         }
    return $form;
    }
}

As far as post submission I have tried tons of different ways to get it to set_post_Terms but couldn't get anything to work

add_filter('gform_post_submission_2', 'GF_update_product');
function GF_update_product ($entry) {

  global $wpdb, $post;

  $id= $_GET['kr_id'];

   $entry["3"] = array();
   foreach($entry["3"]->value as $term){
      wp_set_post_terms($id, $term, 'product_category' );
   }

}

Okay, I switched over to after submission

I was able to get the pre-render to work (kind of) using in_array and isSelected. So it appears correctly, however once I did this now GF is not recognizing and submissions from the field, the entry object is always empty.

add_filter('gform_after_submission_2', 'GF_update_product');
function GF_update_product ($entry) {

  global $wpdb, $post;

  $thenumber = $_GET['kr_id'];

	$tripdesc = array();
	$tripdesc['ID'] =  $thenumber;
	$tripdesc['post_content'] = $entry["2"];
	$tripdesc['post_title'] = $entry["1"];
	wp_update_post ( $tripdesc );

   __update_post_meta($thenumber, 'mp_price', $entry["4"]);
   __update_post_meta($thenumber, 'mp_shipping', $entry["5"]);

	$terms = $entry["3"];
	foreach($terms as $term){
		wp_set_post_terms($thenumber, $term, 'product_category' );
	}
}

add_filter('gform_pre_render_2', 'populate_each_product2');
function populate_each_product2 ($form){

global $post, $wpdb;

$id = $_GET['kr_id'];

if(!empty($id)){

        foreach($form["fields"] as &$field){
            if($field["id"] == 1){
                $field["defaultValue"] = get_the_title($id);
            }

            if($field["id"] == 2){
                $field["defaultValue"] = get_post_field('post_content', $id);
            }

            if($field["id"] == 4){
                $field["defaultValue"] = get_post_meta($id, 'mp_price', TRUE);
            }

            if($field["id"] == 5){
                $field["defaultValue"] = get_post_meta($id, 'mp_shipping', TRUE);
            }

            if($field["id"] == 3){
            	$args = array( 'hide_empty' => false, );
            	$cats = get_terms('product_category', $args);
            	$field['choices'] = array();
            	foreach ($cats as $cat){
			$name =  $cat->name;
			$val  =  $cat->term_id;
			$term_list = wp_get_post_terms($id, 'product_category', array("fields" => "ids"));
			if (in_array($val, $term_list)) { $select = true;} else { $select = false; }

				$field['choices'][] = array( 'text' => $name, 'value' => $val, 'isSelected' => $select);

                }
            }

         }

    return $form;

    }
}

Okay so doing it manually worked, but isn't ideal:

$terms = $entry["3.1"].', '.$entry["3.2"].', '.$entry["3.3"].', '.$entry["3.4"].', '.$entry["3.5"].', '.$entry["3.6"].', '.$entry["3.7"].', '.$entry["3.8"].', '.$entry["3.9"].', '.$entry["3.10"].', '.$entry["3.11"].', '.$entry["3.12"].', '.$entry["3.13"].', '.$entry["3.14"].', '.$entry["3.15"];

   wp_set_post_terms($thenumber, $terms, 'product_category' );

Is there anyway around this?