you could be overtraining your chest. try to lift the same with your friends. its true that less is more when it comes to training. train hard but low volume (low sets and reps) your cycle wont help that much because it is a training problem. if you arent growing without gear, you wont grow much with it. diet/training are the staple to a physique. the gear takes you to a different level.
lower your exercises to only flat and incline pressing. if you can do weighted dips, do them too. you should not be doing 5 sets on any chest exercise. my chest is probably my best part next to my back because all i did were the basic free weight movements and i stuck to only 3 exercises, mainly 2 switching up a third. for my chest, ive always done flat dumbell presses, incline dumbell presses and either flat/incline dumbell flyes. i dropped the dumbell flyes and do weighted dips now. i did 5 reps on the last set with 60 pounds after flat and incline pressing. also, you need to increase your strength every time you go to the gym. you must add weight to the bar or increase dumbells. make sure you eat at least 1.5g protein/lb of bodyweight, if not 2.0.