I am proof you don't need much. I compete at the national level as a heavyweight, may even be super heavyweight this year. Until this year when I hired a coach, my peak cycle was 525 mg a week the last 4 weeks of prep. My coach doubled my dose. The only thing I can say about doubling the dose, I don't have to cut as hard. My calories are still REALLY high compared to where I am at normally on 400-500 mg a week.
I think it was Dan Duchaine who use to say, "food is the most anabolic thing you can do for your body." If you are not training 100% and eating plenty of calories to support growth, it going to be hard to grow. Michael Phelps during his Olympic training ate 10,000–12,000 calories/day, he was skinny. I did a nutritional analysis on Phil Heath after a contest, 9394 cal/day with a whopping 3.25g or protein/pound of body weight. I remember my days in powerlifting when I had a talk with Louie Simmons who was here in Houston at a THSCA conference. I was in the 242's and he told me I was not eating enough. He said If you want to have big lefts and be competitive, you need to get that weight up over 300lbs. Sure enough.....
@genetic freak I get people come up to me every day in the gym and compliment me for how hard I train. Almost 70 and I out work most all in the gym. Well shit, this is how you train, balls to the wall. Its all I know. I don't carry my damn cell phone to distract me, I don't talk to people and keep the music in my ears so loud I can't get hear conversations and get distracted. When I sit and rest,,, all I think about is how much more I have to bust my ass on the next set. I have told quite a few people who wanted to be good powerlifters that I can teach you how to lift, but you have to put out the effort and do the work. That's the hardest part. Like you said, most people never grow or get stronger because they work at about 40% of their capacity. Most then are afraid to eat enough to support growth. Trust me, I know how much dedication it takes to hit that SHW category. Good luck to you!