ironsoldier77,
Voc Rehab denied you " I have been unemployed since 2008 and I went through voc rehab and they found me infeasable for work,untrainable,not expected to get gainful employment"........Did you push this issue with your claim, The VA would have a hard time explaining this in a IU denial.
I think the TBI claim will get you some more %, but it would seem you are already eligible for IU regardless of the TBI award. I also see mention about a Back, and knee condition......are these possible SC injuries?....If so, file for them NOW while your prior claims are fresh.
If you do not already have one, get a copy of your SMR's.....
Don't give up, all of us here have been there done that.......you will learn patients, but things will go smoother if you dot your i's and cross your T's for each condition you claim.