Here is some more evidence, thanks to USC's scout site.
http://usc.scout.com/story/1377439-lewis-tough-enough-to-eat-nails
He seems more concerned with addressing the question "why" rather than "how much", a philosophy he's cultivated in his own time as a head coach and a method he says differs slightly than his mentor's. "It's not always about the weights, it's about the whys. Why we do things." Lewis explained. "Coach Carlisle's philosophy was really about how to, how fast, how much."
This quote helps strengthen (lol) the previous statements on why the S&C program is much more difficult now. Under Lewis, it isn't always about the weights, and it isn't about completing a certain amount. Now, Socha sets quotas for these players to meet and demands that they do these work-outs properly. No shit the S&C is going to be a lot harder when you have a coach that demands you complete what was assigned to you and that you complete them the right way. Just go back to Riva's video. Or look at those Pro Days numbers above. Or back to ASJ's assessment by the NFL scouts, calling him soft.
Other gems from the article:
Lewis emphasized multiple times the importance of players "buying in" to a strength program.
"It's just a great staff who has been put together and we are just buying into that."
"We're going to play 100 miles per hour and we're going to win. It's going to be great."