You seem like you have given this some thought.go for it bud.
You might want to think about doubling the dose however. at least 500mg/week is the norm for test, sensible to stick to the one compound as well. You must remember injecting testosterone will shut down natural production so you must use a large enough dose to replace your natural testosterone production and raise it above normal levels.
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As far as results go that is really determined by your diet and as your preparing to compete perhaps you might not gain substantially because of the cutting diet having said that i'm sure you'll see some noticable increases in size/strength/leaness, the latter needing to be kept in check perhaps with some kind of AI such as aromasin. this may become a problem when it comes a little closer to competition time and you want to drop water weight
I'm sure others will give you a deeper insight into what your getting into though