Personally I do not believe in spot injects bro. Yes they will inflame the tissue around the site making the muscle appear larger for a short period of time(bi's) but I do not believe that it will cause a significant localized growth. As for the gh it is usually used for spot injecting troublesome fat deposit areas(abs,"lovehandles") so I dont think it will do much for the chest either. Hit some incline barbell and dumbell chest exercises heavy and it should come up nicely bro.