Want to throw in my two cents here. I've never been big or very strong. I'm just kinda average looking. But, I've gone from tiny to high average... Anyhow, though I know this will get me laughed at, a few months back I was repping on flat bench with 235. That was a lot for me. I felt good, so I kept doing it and doing it. Honestly, after the first month or so I didn't really get any more growth though I tried to keep the weight heavy. The problem was my triceps were lagging.
My chest does most of the work during bench. I don't know why, but it always has. And, I can't seem to get good growth for triceps with isolation movements. AND, true close-grip benches kill my shoulders and elbows. Though I still do isolation movements for the triceps, I've modified how I bench so that my hands are about 5-6" closer together- which still isn't and extremely close grip. I've had to lower my weight (all the way down to 185 initially- see, told you you would laugh...), but for the first time, my anterior shoulders and inner tricep heads are getting adequate work. My chest is growing again and still gets sore every workout, but my shoulders and elbows don't hurt. So, sometimes it can benifit to lighten the load for the right reasons.
Jacob