Enfold Menu Item Limit

We seem to have hit a wall with the number of menu items we can have on our site. Every time we add a new menu item, the item drops off the end after saving, and the menu location is unchecked. I’ve seen several users with this issue, but increasing the max_input_vars in php.ini hasn’t worked for us, and neither has defining the wp_memory_limit. Here’s a link to the site:

http://blackwingnotebooks.com

We only have about 60 menu items, and we would like to have around 85. Any help is greatly appreciated. Thanks!