How about you try doing a co-wash(using conditioner instead of shampoo to wash your hair) Try using a good conditioner(I use Mane 'n Tail Conditoner and Argan Morrocan Oil) I also pull my hair back into a protective bun before I sleep and I use a satin nightcap.
whurly girly (2C/3A).
thick; medium/coarse; low porosity.
hair that is drier than the sahara desert.
LOW-POO: Renpure Organics CO: L'Oreal EverCreme Cleansing Conditioner RO: Renpure Keratin Conditioner. New HG! LI: L'Oreal EverSleek Humidity-Defying LI Creme Styling: SM Curl Milk, Argan Oil for sealing, sometimes GFPC Gel, some honey for hold, TIGI Control Freak Serum!!
It sounds to me you're just hesitant to accept your hair's natural volume. I too have a lot of hair, and even if I come across a frizz-free day, it's still voluminous.
If the volume really bothers you, then try half-up half-down styles or go with a stronger gel/heavier product to weigh the hair down. (Granted, the second suggestion has never worked on my hair, but give it a try.)