Hi Lorrie,
I'm not sure why these are working so well for me. I believe it's all the reps and a bit lighter weights. I don't use anything higher than a 24 lb weight load for legs in her workouts and as a matter of fact, I just raised to 24. I started with 16, then after about 4 weeks, went to 20 and now the 24. During my freestyle rotations, I did use lighter weights but didn't do nearly as many reps as are in her workouts.
I do prefer Ripped to the Core because the other can be a little monotonous but I always feel the pain the next day or two. The DOMS still continue even though I have been doing them for 8 weeks now.
As far as my diet, that really hasn't changed all that much. I did try a modified Eat to Live type diet but reverted back to where I'm eating approx 40/40/20 ratio.
HTH!