This may help...
Here's my recipe for Apple Crisp. It turns out right every time. I'm sure you could substitute your peaches and berries. Make sure you cook it long enough to get the top crisp. If you serve it with vanilla ice cream, it won't matter if it's extra juicy. (I usually add more granulated sugar...probably 3/4 cup.)
Apple Crisp
* 3 pounds tart apples
* 2 tablespoons lemon juice
* 1/2 cup brown sugar
* 1/2 teaspoon cinnamon
* 1/2 teaspoon nutmeg
* 1/3 cup all-purpose flour
* 1/3 cup granulated sugar
* 1/3 cup rolled oats
* 4 tablespoons cold butter (1/2 stick)
* 1/2 cup chopped walnuts or pecans (opt)
Peel, core and chop apples, toss in a bowl with lemon juice to prevent
darkening. In a separate bowl, combine brown sugar, cinnamon, and
nutmeg; stir into apples. Set aside.
In another bowl combine flour, sugar and oats. Cut butter into 8 pieces,
and cut butter into flour until mixture looks like crumbs. Stir in nuts.
Butter a 10 X 10-inch baking dish. Spread apples in bottom of baking
dish then sprinkle with flour mixture. Bake at 375° for 45 minutes, or
until apples are tender and topping is lightly browned. Serve warm or at
room temperature.