Well once we reach sticking points and genetic limitations(or we'd all be 450 @ 6%) then the only way to grow is by stressing the body more... This can only mean 3 things really - stay lifting heavy(force growth - overload), keep intensity as high as possible(supersets tri sets drop sets RPs), and with HIT there is no break once you start that working set you go right into your drop sets and RPs forced reps into negatives etc) - I'll rest 1min between ex's(not sets)... So once my working set starts there is no rest until my drops RPs or forced reps into negatives are finished then 1min Max in between exercises
Try starting with flys to shock your chest(heavy but very controlled) form is key... Taje those flys to failure... Then use that same weight(or less ir more depending on you) for pressing... So your Supersetting flys straight into presses(it's a ore-exhaust method of HIT! Got me past some major sticking points too!
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Get in here and start reading you'll be amazed!