Strawberries

I picked one and a half quarts of strawberries. We have them in a raised bed that is 4x8.  We planted almost 45 plants last spring and they have probably doubled. The result is some of the berries are not ripening good and down in the bottom some have  molded. Also snails have invaded because of the dew and  rain. I thought about snipping the leaves off the top so sun can filter down but I'm afraid it will ruin the plants.  We will have to transplant them this fall into a bigger bed.