| I think you are starving yourself on 1,500 cals a day assuming you are 'average' height and such.
I am a big fan of carb cycling...but remember the body goes by trends in calorie intake. if you starve 3 days then pound an extra 2000 calories in, the body finds no happy balance point.
I'd keep the calories more consistent. use more protein and fat on low carb days to bring up the calories.
LV had me on a diet like that. the carb cycling was based on days I didn't lift weights as being my low low carb days, and i had moderate carbs on days I did lift.
calories never fluctuated more than 200 between days. And I lost close to 2lbs of fat a week, consistently. | 
