I would guess you are doing it wrong, as I see only progress for myself. I do not do any cardio, as most days I am left sucking air. Not really true, I do take a walk in the morning, before eating, and gulp down BCAA's before leaving.
Also, you said "Monday" training. Which phase?
And also, re-read the tab on "Perfect Rep", specifically for you, the second page, where it talks about reps, sets, etc.
You are probably using his model as bible and not deviating. CT wants you to use your brain, use his program as a guideline and make modification that would best suit you.
IE: I can't do bent over rows with barbell (bad back), I just use something else (Machine rows, improvise with a bench and a cable row, etc). Also, if I feel feel that 6 sets is not enough, I add more poundage (as described) and do a 7, 8, 9 or 10th set.
All of the above are described in the program.