Implementations of hook_order() of modules heavier than uc_ideal_pro are not called

I'm not sure to which value the module's weight should be set exactly, because when you set a value you can not be sure if there is yet another module available that is even heavier. uc_node_checkout has a weight of 100, so the weight should be at least set to 101.

I now have fixed it with the code beneath. This code will loop through all enabled modules that implement hook_order(). Then it asks the database what the highest weight is of those modules. It increases the returned value with one and sets the weight of uc_ideal_pro to this value. This way you are sure uc_ideal_pro is the heaviest module that implements hook_order().
The only thing I'm not sure about, is when this code should be called, but I think it should be called every time a new module gets enabled (because in theory that module could be heavier than uc_ideal_pro).

/**
 * Makes this module heavier than the heaviest module that implements hook_order().
 * @return void
 */
function uc_ideal_pro_makeheavy() {
  // Check which modules implements hook_order().
  $hook_order_modules = array();
  foreach (module_list() as $module) {
    $function = $module .'_order';
    if ($module != 'uc_ideal_pro' && function_exists($function)) {
      $hook_order_modules[] = $module;
    }
  }

  if (is_array($hook_order_modules)) {
    // Load maximum weight
    $sQuery = "SELECT max(weight) AS weight
    FROM {system}
    WHERE type='module'
    AND name IN (".db_placeholders($hook_order_modules, 'varchar').")";
    $iWeight = db_result(db_query($sQuery, $hook_order_modules));

    // Increase weight with 1
    $iWeight++;

    // Save weight
    db_query("UPDATE {system} SET weight = %d WHERE name = 'uc_ideal_pro' AND type = 'module'", $iWeight);
  }
}