Man, I still think you need a larger turbo than that.....40trim isn't going to hit the sweet spot at all. If you're only planning on max of 7psi, then you should be ok....but any higher and your turbo rpm is going to be over 140,000. and you'll be at 50% efficiency....
Read this to figure everything out... http://www.gnttype.org/techarea/turbo/turboflow.html