Just try and keep working your way up in weight! Don't give up. If you're repping 315 and your bodyfat is in control, you're not going to have problems with chest thickness.
If benching is working for you, maybe try more work with dumbbells and experiment a bit with TUT and pre-exhausting. Without knowing much about you or your training history, its fairly difficult to make an accurate assessment. Hopefully this will point you in the proper direction though!