As far as hitting a wall, two things come to mind.
First, don't forget that you're burning noticably
fewer calories when you do your cardio without those thirty pound plates on each shoulder. If you haven't changed your intake as well you're not going to have calorie deficits as large as they used to be. Your calorie deficits could have also taken a hit if a significant portion of that sixty pounds was lean mass. Muscles burn cals 24/7 and every pound you lose lowers your daily calorie requirements accordingly.
Secondly, when you've got a lot of weight to lose you can more easily afford to pay primary attention to total calories alone without worrying as much about the exact breakdown. But as you get closer to your goals you need to be more aware of the little things, hidden fats here, unnoticed oils there...that kind of stuff. Even though you've been at this for almost a year, if you haven't been keeping a food journal you should probably start. It's amazing how many little corners we can cut without realizing it if we don't keep track of intake.
As for
gaining muscle, you're pretty much going to have to incorporate weight/resistance work. Cardio is great for a lot of things but adding muscle mass isn't generally one of them. If there's any way to work some sort of lifting into your schedule you should give it serious consideration.
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