I like cable kickbacks as they keep tension on the tricep the entire movement. I also like skulls, probably my favorite tricep exercise of all of them. I do CGBP but I just can't seem to really target my tris. I ALWAYS feel it in my chest, I prefer isolation movements for my triceps.
If you find that you use your chest too much in CGBP try supinating your grip and you will find that it naturally forces you elbows closer to your sides and puts a lot more emphasis on the tris.