In this recipe variant I disabled the Glycine-Start option parameter (GStart) as default, so the acids won't be turned to Glycine at the beginning, to prevent destroying too many bonds and dropping the score and I take the reverse order, to get a maximum length as soon as possible.
If you want to to do it the hard way, turn this value to 1 and take OrderStyle 1 again, to start with blank backbones, "growing out" the sidechains.

Now, as the new snapping command is implemented into fold.it's LUA-version, I will try to add it into this script, too, which means even more possibilities (of direction) for a mutated sidechain.