Yes I agree with Aliam, actually I was going to ask you ken, how do you know that Ventratas have rooted, and some has small roots! You pull them out don't you?
If I were you, I stick the cuttings in the potting mix, and let them be, you know that they have established, once they produce pitcher, or at least 2 new full leaves. Do not observe them too much or else you disturb them too much and you might kill them.
You realize that most nepenthes do not like their roots to be disturbed some species are so sensitive that even an established plant might die because the roots were disturbed. I think Bicalcarata is one of these at the least. There are other species too.
ken if you disturb your cuttings again, I hit your hands with a stick! hehehe!
joke of course!
TTFN
Arvin