I think suckmymuscle recommended the closer grip to me for a better stretch and contraction (more distance to move the weight) and my chest has thickened and my pressing strength has gone up due to stronger triceps. Along with grip, look at elbow placement. I am working with an elbow tuck as well, similar to Branch Warren and it feels great. Try the closer grip and see if you notice a difference in stress felt and progess that is made, or not. One thing though, after reading your post again it seems like you are just after tricep growth and strength. Closer grip will do that but as Norcal said, do it on tricep day and work a normal press or a DB press for your chest. You are still doing both movements and getting double benefit, especially if the BPs being worked are given enough rest.