It seems like muscle building/physique improvement is the goal that is at the forefront of your mind, and in that case I suggest the same thing a few others have and that’s to change your training program. Look for something that includes work for your upper chest. A bodybuilding program is a good idea because it will help create balance in your physique and work some small muscle groups that have been neglected in the 5x5 scheme.
These would be my 2 favorite Bodybuilding programs on this site. Give them a go, but make sure you’re following the dietary guidelines and getting a ton of protein in. These programs aren’t for wimps, so make sure you hop into this with the right mindset!