Try the "Shock Treatment" by Dr. Timothy Scheett when you've stopped growing.
The 4-8-12-16-set program ››
For this workout, select weights that you can perform just under
failure for the amount of reps for each set. Following a warm-up,
perform 4 reps, rest two minutes; perform 8 reps, rest 1.5 minutes;
perform 12 reps, rest one minute; then perform 16 reps.
reps, rest 2 min;
reps, rest 1.5 min;
reps, rest 1 min;
"Shock Treatment." Muscle Body Magazine. N.p., n.d. Web. 17 May 2013.