I am not sure if this will help but here goes nothing. Your hair actually looks like it's holding the twist very well at your ends so you're one up on me. I have to bobby pin my flat twists to keep them from coming undone or secure the ends with Bantu knots or perm rods. If your twist looked defined before you got to the ends you may get by with bobby pinning them down sort of behind the twist. Just be careful when putting them in- you don't want to damage your hair.

For the flat twisting portion it looks like one or two things it took a lot of practice for me to get too. First make sure you are only adding hair to one side at a time: so just make sure you have two defined sections before you twist together and grab a new hunk of hair to add to the other side of your twist. Second, I've found that my flat twists look much better when I use smaller sections to add to the twists.

I hope that helps! Also, what if any product did you use on your hair for this?

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3C/4A Fine texture, low porosity, low/medium density? Trying CG since Dec. 2013
Shampoo: Curl's Creamy Curl Cleanser or clarifying shampoo when needed.
Co-wash: Curl's coconut curlada
Deep Condition: Experimenting in the kitchen
oil: flaxseed and coconut for treatments
Styler: Tresemme conditioner, alone or mixed together with aloe vera gel
Sealer: aloe vera juice