So you can watch my second attempt with MG3 here.
Things I did differently?
1. Fewer Braids.
2. Cornrowed the base, instead of individual threaded sections.
3. Wound the thread around the base only 2 times.
4. Wound the thread more firmly down the length of the braid. This resulted in a stiffer braid.
5. Left a lot more excess string at the ends, and tucked them away.
I'll be back in a couple of weeks to share if any of this helped.