Hi Travis - firstly, good on ya for giving up the smoking
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I can't remember what the 30 day shred is but I'd be careful if it means restricting certain foods such as carbs. You are still EBF so your body will need to have extra cals for that.
However, you don't have to be eating less healthy stuff so I'd try and do what you're doing with the walking/cal counting (taking into account 500 extra a day I think it is for bf). Then, with all the walking that'll sure tone you up.
Also - although you will need the extra cals, that doesn't have to come from fat. So cut back on stuff like cheese, crisps, processed foods and concentrate on whole grain bread, rice and pasta, lots of fruits and veg and cut out fizzy drinks etc.
I used to stock up on yoghurts and pots of cottage cheese to eat with pineapple and I ate lots of prridge and other healthier cerela if I got hungry at night for example.
Exercise-wise, the walking is fab for toning, are there any water aerobic classes nearby? They are great cardio and more gentle after the section than heading off down the gym.