Well, here's my advice:
At 230 lbs and doing 30 mins of cardio, plus all the other daily activity - 1400 calories or less is NOT ENOUGH FOOD.
You're starving your body and it's holding on to everything you have for dear life.
You also say your fat intake is low - what do you mean by low? If you're not getting at lest 20% of your calories from fat, you could be further stalling your weight loss. Despite what magazines and fad diet books will tell you, your body NEEDS healthy fats.
Honestly I started losing at the same weight as you and was losing steadily on 1800 calories a day. I didn't drop down to 1500 calories until after I dropped into the 170s and hit a plateau.
I'd suggest raising your calories and really concentrating on WHAT you're eating as well as the calorie level you're meeting. Make sure you're consuming a lot of veggies and fruit, lean proteins, and complex carbs. Try to get your healthy fats (things like olive oil and avocado and nuts/nut oils) up to about 25% of your calories.
I think you'll see a difference.
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