Heavy Supersets for Low Reps
Try this - Superset Flat Bench with Incline Bench for 3 reps on each. Minimal to no time of rest between the two.
I did this for 5 sets total. With this you get both strength work and hypertrophy training.
Supersetting these two big compounds hits both upper and lower chest, it builds the triceps and you'll be surprised how much your core (and) and back will feel during these sets.
I recommend doing this near the start of your training session, otherwise you'll be too exhausted to give it your all!