Ahh, so ENFPs can be correctors too, eh? What I generally read is that ENFPs tend to be stubborn in the sense that they have firmly held beliefs (Fi), but that they tend to try to bring other people to those beliefs through careful persuasion because of their sensitivity to other peoples' feelings.
Hmm, Keirsey's description posits that ENTPs are 'laid-back and non-judgmental'...a result of the inherent flexibility in their perceiving rather than judging function. So maybe while good debaters when it allows them to explore each side of an issue and increase their body of knowledge, they aren't necessarily adamant on insisting that others conform to those ideas - perhaps that's more ENTJ material?
While both perceiving rather than judging types, does their Te tertiary possibly imply that ENFPs might have a greater need than ENTPs to attempt to make the external world (and those in it) conform to a certain pattern that's seen as rational, while an ENTP with their auxillary Ti would be content so long as a pattern can be devised within their person?