...........does the tail fin effect the tail rotor from doing it job?........

With the tail rotor on the right side of the boom I'm finding a tendency for the prop to "suck" the tail fin into a near strike.
I've heard that the DD tail with the prop on the left side alleviates that problem.
That said, I've found some of the plastic tail fins a mite flimsy for my taste so the installation of the new DD tail may help.