Impulsive behaviors

Hi, I am new. I have a 11 year old who was diagnosed with Aspergers at the age of 8. I have raised my son single handedly for almost 12 years. However, he is getting older and physically aggressive, stronger.
He has pushed me into things (leaving bruises), pulled knives (which I hide now). I have tried it all to help him. Parental class, coaching, books, therapy, reward chart, diet,  consequences, meds.done it all.
It breaks my heat to even 'think' of sending him to live out of state with his father-3000 miles away. Obviously, It is not working for me...and there are no other options. I feel if I do not do this he will end of in Juvy or hurt me in his uncontrolble rage moments.
I worry if I am making the right choice. He doesnt want to go, but refuses or doesnt know how to change. He says he can not stop and think to count and calm down. I have seen this since the age of 4. I also have seen emotional
disorders with every male on that side of the family. Rage issues.
I can not get through to him. I am worried sick-as I just want the best for him before it is too late.

Anyone out there have suggestions, been there?
I am open to trying anything!
Thank you!

[Kage_no_Taren]

I have a question that may sound accusational, but is not, and is drawn from my own experiences as a person with asperger's and anger issues.  Does he ever (or did he used to) make a visible effort to calm himself down? And if so, how do you respond?  When I wad younger I would get very angry, although not usually violent, because I couldn't take deep breaths, count to ten, or do anything else to calm myself, because if someone, especially and adult, saw me doing that then they would know I was upset and start trying to help and intervene ( due to my history), on the assumption that things might get out of hand, and I couldn't deal with communicating with and reassuring them while dealing with everything I was feeling.  
I don't know what it is that sets him off, so I don't know how to give tailored advice, but in my experience, the thing that makes most of us aspies angriest is being interrupted (even by someone trying to help) when we are doing something difficult or frustrating.  So without more information the best advice I can tell you is to resist the urge to involve yourself immediately when he seems upset, frustrated, or to be having trouble with something, and wait for him to ask for help or until he seems more relaxed.  If you tell me more about what tends to get him going, I may be able to give more useful advice.