stick to dips, pull-ups, handstand push-ups. Keep loading in a range that allows for 5-6 sets of 5-6 reps. Try to add load each workout. Once you stall out shift gears to new movements or work a block of strength work (10 sets 3 reps). Check out the Mass Gain article for more info. Do some lower body work like squats and deads! It will help the upper body to grow!
Keep us posted on your progress!
"Survival will be neither to the strongest of the species, nor to the most intelligent, but to those most adaptable to change."