Primo - quick results, and only 4 weeks of a light cycle? I dont know that you'll see much of anything, if its even legit. If its not, I hear Deca is the common fake, which is probably "better" but not when used alone.
How sure are you that its the real thing? If its Deca I would not do more than 200mg a week. Test cycles by themselves are fine, but 4 weeks is a waste, you'll just be getting started right around that time, 3 weeks at best.
Dont forget your post cycle therapy. I would have went with prop from what you mention, or just fina.