Create a CAW that is a super heavyweight and get his attributes as high as you can (playing season mode once should do it). Then go to the CAW menu and copy him. Go into the copied CAW's profile and change his weight to DIVA weight and continue to exit.

Exit the CAW by going to continue but don’t save. All the experience points from the copied CAW will be remove from that CAW and placed back in your experience pool. This will give you a ton of experience points and can be done over and over.