Joe-
Here's my $.02 on DC training- it works! BUT do not try changing it around for at least a year. I've lifted for 30+ years and thought I was smart enough to "tweak" his program to fit me before really trying his program.
For about a year I screwed around with my "bastardized DC'" program- it was ok, but the results were the same as every other training program I've stuck to- slow...
Do the DC two-way exactly as outliined- I mean exercise order, nutrition recommendations, cardio, no extra exercises or sets- just follow it. I am almost positive it will add serious muscle to your body.
And again, I screwed with frequency too, DO NOT! If done right, the M W F workout days are fine (one thing I do change; I work out W F Sun). Don't think you can do every other day- you'll need that 2 days off after hitting it hard. I was a gym addict- 6 days in gym was barely enough. You just need to get past that and you will start growiing again.
I wish you the best with DC- I'm a life-long believer after I finally put my ego in check and just did what the program said.