no one has made mention of his reps per set?
i'm a believer that muscle burns adipose tissue.i think the reps should be lower as in a proper resistance training program for creating hypertrophy.use you cardio training to reduce calorie intake and your resistance training for creating musculature.i know someone will flame this for whatever reason.people get on these high rep schemes when they want to increase weightloss.they say curcuits keep HR higher.cardio can be adjusted to stay within your maxHR and as you move to your resistance program you can certainly keep it in your 50-60% range.you will have just as much flow of blood and nutrients to both your connective tissue around joints and your muscles if you drop your reps/set by 3-4 reps.
your abdominal training right now is purely for stabilization at this point.and since we are talkign about stabilization, include hyperextensions in your back workout.keep your opposite muscles groups equally strong or next you'll be coming to us asking why your back hurts.
i'm just throwing some thoughts out that came to my head.this isn't an exhaustive post on options.we'll see if you're still on the board in a few weeks and then maybe i'll get into more.