I've found that changing the order of what excersises i do has made a diffference in growth. For example for chest i started doing my inclines first and moved flat barbell bench to the last thing i do and noticed quite a bit of change. Delts I've been starting with arnold presses to pre exhaust all 3 delts before isolating them. Do you work out with a partner? Doing any static excersises? Negatives? Forced Reps?