i was having the same issue. you could be storing fat in your chest. I can keep a six pack w/o working out but if i stop working out my chest, fat gets stored there easily for my body. it sucks but hey try to loose some body fat. it helps tremendously
i ran 20mg for 4 weeks with my first cycle along with test-e 250/week and i blew up! week 2 i could see good strength gains and size gains 20 was perfect for me. The old timers didn't use that much and they seemed to grow...
i did it naturally i followed the Arnold routine that he listed in his Education of a Bodybuilder book. i also followed his diet..in two weeks i gained near 10lbs. not all muscle obviously. but def worked