for me, putting my hair in smaller braids (slightly smaller than a no. 2 pencil )does the trick and keeping moisture on the ends. last but not LEAST keep your braids tied down at night with a full satin cap !
when I braid my hair I use a lite gel, this helps to keep the braids nice looking and helps with the matching of textures (natural and synthetic) together. I hope this makes sense, it's kinda hard to explain.