The question that has to be asked, before we jump to any conclusions is, "should it be able to?" In other words, are the Wurm and Wolf CS on equal footing via fleet pts/OPs/credit cost? If they are, then this becomes a glaring imbalance. If on the other hand, the total cost of ownership of a Wurm is higher than a Wulf's by a wide enough margin, then it really means everything is still OK.
I don't know the answers to this right now, but I know I spent a good deal of time setting the balance sheet values for the Wurm and it behaved according to all my expectations at the time, given its fleet point values and such. Things may have changed since then, I dunno.
I'll have to revisit this one in the near future.