If you are only making 11 psi boost max then start adjusting the rod at the exhaust flange side. Run the two nuts to make the rod longer and the boost should go up. Or is it the other way around? Just change it one way or the other and you will figure it out.
I am rethinking, the boost builds and then pushes that rod out and opens the wastegate. So less boost would open a longer rod and more boost would be needed for a shorter rod. OH Crap, change something, what else do you have to do with your tinker time?