For the curl,
You can see in the last picture posted that I lowered the height of the component and tilted it slightly to align with the upper part of the leaf.
I believe in the old saying " What you see is what you get",,,and I work to make the components do exactly what I want.
As for the second leaf,, more 2 rail sweep stuff.
I just try to envision what the profile would be if I cut it in half..
That's the shape I use for the vectors.
And after some sculpting, adding a draft and smoothing,,it comes out to be an acceptable component.
For me, there's a lot of unknowns of what is needed to do until I get to that point...
Being efficient in your choices of how to make an component behave as you want them too is an important factor.
If you don't know what tool or option to choose, you'll end up wasting time..so the moral of the story is practice and remember what you did, or you'll need to learn it over again..