Rather than using `drush geocoder-backfill`, I'm running `drush scr /path/to/this/file` on cron to update profiles.

gistfile1.txt

<?php

$range = 50;
$offset = variable_get('my_custom_profiles_update_offset', 0);

$query = db_select('users', 'u')
  ->fields('u', array('uid'));
$query->join('users_roles', 'ur', 'u.uid = ur.uid');
$or = db_or();
$or->condition('ur.rid', '9', '=');
$or->condition('ur.rid', '15', '=');

$query->condition($or);
$query->range($offset, $range);
$results = $query->execute();

while ($uid = $results->fetchField()) {
  if ($profile = profile2_load_by_user($uid, 'my_custom_profile')) {
    $profile->save();
    print ("\n updated " . $uid);
  }
}

variable_set('my_custom_profiles_update_offset', $offset + $range);