About 20 years ago I would always go heavy on flat bench press. Working up to 405 for 3 to 5 reps
I ended up tearing my left pec and bicep. I thought shit man, that's the end of my big chest!
After healing up for 6 months I started flat bench again. Instead of going heavy and fast I used light
weight and really focused on feeling, form, stretch, flex and going slow for 12 to 20 reps, on all chest
exercise's, for 15 to 20 sets. I was amazed, after a year my chest got even bigger then before.
Today I never go over 225 on flat bench. You might want to try flat bench with your feet off the floor,
and on the end of the bench, from time to time. Be careful with this one!