Re:Powerlifting and weight management...
If you can do 50 reps sets on abs then they are not heavy!
You do the stepper holding plates? Why not just change the settings? And what are the push ups for? It seems to me you have a bit of a mish mash training.
If you read my post I said I would add your cardio 1st on other days (as in not squat or deads). I think 30 mins to start with should be fine. If you are getting fat then you have to either up your output or cut back on your input! Just because you want to powerlift doesn't mean you have to give up the ghost on looking good it just means that being ripped is not a sensible option.