750 mgs is a lot. You can stay with it or maybe drop it to 500 mgs and run it for 2 more weeks if you like. You might wanna look into the single est like razor said. Sust is known for side affects. Also you will probably be told to jump start it with dbol or something. You dont have to. Its nice to have fast acting aas while you wait for the sust to kick in. Other than that: Sust is good for 2 to 3 months by itself. Just start saving money right now for you next cycle and try to include a good stack. Im assuming you are gonna use Nolva or clomid after the sust cycle right?