What's 'too sweet'? It's TOTALLY different to each person.
There are a few things one can do to help cut the sweetness in b'cream recipes.
1) reduce the sugar by 1/2 cup
2) replace 1/2 cup sugar with 1/4 cup cornstarch
3) add up to 1/2 teaspoon salt
4) add more flavoring. Most recipes don't have enough flavoring to begin with. Use up to 2 Tablespoons. Make a mixture of 3 different flavors. Example: 1 teaspoon lemon flavor or juice with 2 teaspoons orange OR almond flavoring and 3 teaspoons vanilla. Don't be afraid to try new and different combinations until you find what is pleasing to you and your customers.