The size of dreads depends on the size of the section where it meets the scalp. If you want fat dreads, then that's cool, but they take very long to dry and put pressure on the scalp due to the weight. If you don't want the fat congo dreads, then it is recommended that the scalp area section is no larger than 1" or a 25cent coin. Sections may look skinnier now, but as they mature they will become the width of the scalp area. If there is no wax in your hair, then yes, they will settle down, but yeah, take out anything restricting the root area. Dreads take time, they will loosen before they start the journey of locking up, so don't worry when this happens, it is their natural way. If you wash & separate any sections trying to join together, then you are doing fine and so are they.
Peace