Honestly bro, 5-6iu will be plenty to evoke some good changes, running into the show. If you can afford to, between now and the time you run out, I would stay on it long term, through your post show rebound and into your off season. I believe that a sustained 5-6iu, for a long period, is going to be more effective that taking double the dose for 1/2 the time. Growth takes time to work, and the longer you are on it, the better the effect will be.
Side note, some a lot of sub q fluid on growth, while others don't. Keep an eye on yourself and be ready to cut it out, leading into the show, if needed. Some guys will run it right into the show though and remain fuller. If you are using t3, you'll find that GH is great for combating the flatness that can go along with throid use.