For me it's the amount of time I let airdry before diffusing. If I let dry to much, it's not as curly. If I don't let airdry enough it get a little frizzy.

Kim
Type: 2c, medium/high porosity, high density, course.
Cleanse: Curls unleashed shampoo
Leave-in: KCKT, Curlsunleashed leave in.
Style: Argan oil
DT: Aussie 3 min. miracle or olive/coconut oil.