I read your letter, but in trying to edit it I had so many questions that I was unable to express what you wanted to express in a way that would gain a positive response. My questions, for example, are you a manager and if not what were you trying to accomplish by writing the letter aside from going over your manager's head? Who asked you to write the letter and why? Do your immediate supervisors know of these problems, and if so why haven't they dealt the matter? As you know, there's a hierarchy in business: you tell your boss or immediate supervisor your concerns along with viable solutions, then you let them take it from there.
I'm just not sure, I guess, what the letter was suppose to accomplish, moreover, what solutions you had to offer the company. In writing such a letter, you want to start off with the benefits, not the problems. Above all, you'll want to go through the chain of command, if not to get people on your side.