the way the wulfen murderpack works, each turn on a 4+ for each group they get to make a free extra move, plus they can run and charge in the same turn, and they can re roll charges, so potentially up to 30" in 1 turn, plus if the TWC roll a 4-5 they get 3" added to all movement, runs, and charges so also a 30" range for them as well. I really like the CC aspect of 40k so im kind of building my list around that, im just afraid if i get a couple first turn charges off they will just think the list is cheesy and broken. As for the long fangs, they are a requirement for the formation.
Another thought, I could go with the blackmanes formation instead of the greatpack, which is very similar requirements to the greatpack except every unit that has the ability to take a drop pod gets one for free and all can come in on turn 1. This would help me surround the enemy and take fire off the wulfen.
http://www.bolterandchainsword.com/topic/316510-the-wolves-are-coming-curse-of-the-wulfen-leaks-pg-55/page-56