My guess is that you're specced or glyphed incorrectly, but since your profile is broken (something that you need to fix) I couldn't tell you. Not that I would anyway, since we generally don't do this sort of personalized recommendations on these forums.
I had a question regarding rotation. I normally spam my SS button until I get 5 points, hit SnD and then continuing spamming SS until I get 5 points for Rupture. Normally by then I have to refresh SnD and barely get a chance to get off a 5 CP evnom/evis.