Hi Christine,  Good fruit set

Hi Christine,  Good fruit set is usually related to pollination. Are you seeing lots of bee activity? The bees transfer the pollen from the male flower to the female flower. Poor pollination causes blossom drop.
Also, fruit set happens during a 2 to 3 week stretch so rainy and wet weather during that time can slow insect activity.
It can also be hard for the bees to pollinate if the plants have too many leaves; be careful not to use too much nitrogen fertilizer with encourage too many leaves at expense of flowers.