Jim, your best off trying to get in to a private company who take on security guards "in-house" as this is the only way you will get a higher wage,
This is because the industry is so competitive if you charge a high rate you will no doubt be undercut by 3-4 or other companies.
Try somewhere like Airbus or a national security company like Chubb who are able to charge more per hour so therefore pay a higher wage.