I assume you mean that you better make sure that you don't overdo things, your overboost switch should be operational, etc. Have you considered using an orifice in the line once you know how much restriction is needed? The reason I say that is because although your needle valve setup looks fine, needle valves can carbon up pretty easy. An orifice would eventually carbon up too, but it could easily be cleaned and restored to near previous condition pretty quickly. Of course, it wouldn't be as fun to adjust!