youll never get your pecs thicker this way,,
reduce weight,,you dont need to bench at your size 315lb,,225-275 will grow your chest if done right 8 reps a set,,
dont lower the bar and bounce it off chest back up,,do it smooth and almost to a touch but not quite,,
eliminate delt work outs
use the incline bench and not the flat bench for your chest,,2 plates each side will do the trick,,
your upper torso looks like it belong on 18 year old while your arms and delts look like they belong on a guy that train for quite some time,,your problem is the over powering of your delts and arms,,
your body fat is 12% and in the picture it gives the illusion of 10% due to lighting
dont let the arms do the chest work,,feel the pecs working and reduce the weight,,i bench 315-405 and im 290+,,you dont need heavy weights to grow thick pecs
good lcuk