I have had a problem with my hair at the back not lying flat and being a nuisance cause it wasn't blending in well.

My solution, which worked great was to buy a Keune Hair Straightener (chemical) and straighten my back side + an inch of the hair system's hair. Apply neutralizer, and then wash thoroughly. I then applied B2B color blender and voila, no more concerns. It's the best it has ever blended.

Hopefully will solve this issue by ordering a:
1. Flatback on the back side
2. Bigger base on the back side...
leaving only about an inch of my real hair just to have an excellent looking back hair line (whatever that is called - nape (?) ).

We'll see how this goes, I'll report back definitely.