A WW point is worth anywhere from 20 - 90 calories, plus they build in an extra 250 calories for zero point foods and veggies. So your 23 points a day probably equaled more than 1150 calories. If you're curious, enter one of your WW days into a calorie counting program and see how many calories you were actually eating.
I think 1500 is a good place for you to start. Give it a few weeks and then tweak if necessary.