This is best used at around 7% flavor unless other berries are used as common flavor compounds can overlap and make it too strong.
Green strawberry is my most realistic strawberry, but it needs a boost from ripe strawberry and a little artificial strawberry to make it perfect for a dessert or cream recipe.
Steep time is only around 10 days so sometimes it's wise to add the strawberry flavoring after the dessert/cream recipe steeps for a week or so.