170lbs...
How many calories are you consuming a day and where are they coming from? You say you want to cut carbs, but are you sure that's where you need to cut from in order to lose your unwanted weight? If you vary in weight, four to five pounds, and you're weighing yourself under the same conditions, at the same time, chances are that your diet is very inconsistent. Maybe you can post what your daily eating plan looks like so others can dissect it?