500mg/ml Blend

Found a new source that has some wicked gear for a country that has shit customs (Aus). Wanted to get some opinions on blends, i.e. favourites, what the gains were like, pinning it etc because in aus its a lot cheaper and more viable to get blends. Found some 500mg/ml Test P, Deconate, Mast E & Tren E all at 125mg each. If i were to incorporate something like this into my cycle over my prep (17 weeks out) when would it best be used if at all?

Jekyll