This is right up my street!
I totally agree with you traditional layering techniques with scissors WILL make your naturally curly hair have more volume. ...More >
At the moment your hairs length and weight has a controlling factor over this, but once weight and length in the layers is removed YOU WILL HAVE VOLUME.
I would recommend having a blading technique (razor may be more known). A blading technique called internal diffusion is a method of removing weight yet retaining length. This method creates internal layers inside your haircut and will not increase volume if done correctly.
In fact it will make your hair easier to style either straight or wavy.
Give you a variety of looks from the one hair cut
Bring your hair to life as this technique makes hair malleable.