supersets. pre-exhaust with isolation moves, then throw in compound lifts.
For example:
flat bench flys (12 reps) ss/ incline DB press (8 reps) 3 sets
incline press-ups (12 reps) ss/ flat DB press (8 reps) 3 sets
finish off with some cable high cross-overs (12 reps) 3 sets
Keep your form, it's about time under tension not weight. Ensure the compound movement is controlled and deep.