I have the same issue. Max bench 365 at 195lbs. Most muscular pose and my chest pops and looks good... raise my arms for a front double Bicep pose... chest thins out. I started doing high rep sets and 100's and really started to see some chest thickening. I still do normal chest day routine but two days after that, I will through in a set of 100's... starting out at 215 till cant lift anymore, then start dropping weight in 10lb increments, until all 100 reps are done. I do these on a Smith machine. I'll usually do bench and incline for a set of 100's. No more then 30 seconds rest, when you need to stop or change weight. May not be ideal for everyone, but the changes I'm seeing is working for me.
Regular Chest day: flat, incline & decline bench. flat bench flys, incline bench flys, single arm standing flys and then posing. Usually do 5 sets of each for 10 reps/sometimes cut down to 8 depending on weight used.