Get some deadlifts in there along with pullups, some cleans and snatches too.

All the big compound exercises are the best for getting more muscular.

Something that you could try which I find good to switch up to when i need a change in my training is HIT. There are videos on youtube showing you the way if you search mike mentzer hit workout.

The HIT principle is that you pre-exhaust with an isolation movement using very slow controlled reps then once you reach failure you imediately superset with a compound eg flyes and bench. The good thing about hit is it is intense and effective and will have you in and out of the gym quickly usually no longer than half an hour.

Workout For Muscle