Just as unp said, you have to add cardio into your routine to shed the fat that is over your abs. 50 crunches 4 times a week are a lot of work for the abs - it needs its rest like any other muscle. I would cut it down to 3 times a week 2-3 sets of 8-12 using a variety of crunches (Swiss Ball helped me a lot).
Best of luck with your goals.
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