Therefore, I decided to add one more elastic at the bottom of the sideburns of the unit (the hairline's extremities). For this, I used the Goody's ouchless adjustable elastic (to be on the safe side, I don't want to tear my lace). I used the regular Ouchless goodies for the bottom part of the unit (4.5 inches). Both elastics go on the back of my head underneath my braids as initially suggested by Tootsie.

 

It fits so perfectly and so snug. The hairline is so flat and doesn't move at all, no need for wig combs and bobby pins at all! I tried this same system on my full LWs with and without adjustable straps, also on my LF...it equally works

 

Here is what it looks like. I could have sewn it better at the side with the black ring (I did this differently with another unit and the ring is not close to the lace at all, more further) but I'm too lazy tonight and it doesn't bother me now. I'll adjust that later. It's supposed to be sewn like this on both sides, right at the angle:

 

For some ladies, only one elastic is enough. But for others like myself, with a challenging head shape, that second elastic gives you the look that a perfect application with glue would give.

HTH and thanks again Tootsie and your mother.