Just give them time. They will set pods when they are ready. I have peppers go through this every year. Seems like the (C. Chinense) or super hots seem to do it more than others, but eventually they start setting pods without fail. I have had pepper plants with literally hundreds of blooms laying on the ground below the plant and then all of a sudden, one day, they start setting and a few weeks later I have a hundred pods on the plant. I think sometimes, plants just are not ready to be a parent and they drop the blooms until they are.

If the plant looks otherwise healthy, then I wouldn't worry about it. I quit worrying about blossom drop years ago.

As far as watering goes, it is usually better to let the soil almost completely dry out between waterings. Your plant will let you know when it needs water. They will start to wilt pretty bad in the mid day sun and if you water them, a half hour later, they will look great. Peppers don't like to have constantly wet soil. Damp is fine, but they don't like to have their feet constantly wet.

From what I am reading is that your plants are indoors? If so you may need a fan or paint brush or give your plants a good shake to knock the pollen loose to fertilize the flowers. If they are outdoors then follow the advice of esox07.

Flower drop probable causes:

1. Day temp too high >95F

2. Night temp too low <65F or too high >85F

3. Too much nitrogen fertilizer

4. Too much water

5. Low light levels (reduces fertility).

6. Very low humidity (reduces fertility)

7. Poor air circulation (air circulation contributes to
pollination).

8. Lack of pollinating insects.

9. Size of pot

10. Too much mineral in feedwater.

11. Too much grower attention/anxiety.