Even though the curls had tylose, they didn't set rock hard...when they came off the toothpicks, they were very strong, but almost springy...I was able to stretch the ones that I felt were too corkscrew-curl and not wave-curl LOL...I did this for alot of the back hair. I didn't think it would look good to have the back pouf-ing out like the sides, so I wanted less curl there.
If you look on the right side of photo 4 you can clearly see a few that have been stretched...their curl was much tighter off the toothpick, and it's not that they wilted, they were stretched. Don't get me wrong, I didn't man-handle them...I just needed to elongate some, and I was able to do so easily.
For the root area, I did stretch that end a little, but what really kept it flat was just wetting the underside, placing it, then holding it down for a bit.
I should add...the strands were not on toothpicks drying for days...I prepared them in the morning and by that evening I tested one or two, liked how they looked and handled, and went to work.
As for rolling...in my experience, the trick to doing it with a smoother is to never let the piece get too long for what it's going to be used on...the longer it is, the harder it is to control. It's much easier to roll three 4" pieces than one 12" piece.
So, once you get near the size you need, cut the rest off...then concentrate on uniformity.
When doing hair, if the cut off piece is a useable size, roll that one too, trying to match the width of the one you just did.