Maybe part of your problem is that you think you can clearly describe this setup using only words. I read thru it 4 times and all I can say is I am thoroughly confused. No insult meant to you, as a first time poster, but it amazes me how many folks that call themselves engineers don't fully understand rule #1 - a picture is worth a thousand words. Post your setup, your cross sections, your loading, as images. Here's the deal: words like "wide", "thick", "long", even the word "beam", they mean different things to different people.