Damn this has alot of posts already, my bad i havent chimed in since the update of the site, i usually do like 85 lb skull crushers ive gone uptoo 115 but then got some tendonitis in the wrists a while back so i never went back up that high. pushdowns ont he cable machine i can do like 90 lbs but feel im using too much trap / upper body to muscle it so i stay at 50-70 to really make sure im isolating. im gonna try overhead press with a dumbell today i usually do 70 lb but im gonna up the weight see If i can get the mass from doing lower rep way higher weight sets for 2 weeks. any specific excersises you guys have done and see some good for just mass in the back of your tri's alone, not definition
As everybody said before weighted dips,close grip bench press(CGBP) and skull crushers, a caloric surplus and focus on the heavy compounds will pack size to those tris.