When I was writing cover letters for my last job search I came across a handy software that has templates for all kinds of letters. It's called Easy Letters and you can buy it at www.writeexpress.com

 Well I think the best I can advise you is to keep a silence. I believe the management team have you at heart. All you need is just be consistent and show interest in the work because if you did write the letter to them ,they would begin to imagine this that you are more interested in money than the attitude to work yet their main goal is to see work is driven successfully. Good luck