Personally, I did not see any difference about Wolf's spawn rate at all, still abysmal as Day 1.
The Feedback Forum is full of subject about it, but DE dont seem to care.
All DE said is the spawn chance of Wolf of Saturn Six will progressively increase as the event progresses (Devstream #124 at 10:06)
Ok....what is the spawn rate and how much they are increasing it???????
As I said, I didnt see any increase from day 1 if you ask me
For my part, I am playing this game around 25~30 hours each week, I saw the Wolf 11(or 12?) times and he dropped a total of 5 parts of his hammer (2 BP, 2 handles and 1 head).
(take note I didnt get any part until the 6th fight, and I traded a BP for the Motor)
I consider myself lucky to be able to get these parts, however it took 6 weeks (150~180 hours) to met the Wolf 11 times.
Even if I should not care anymore about Wolf, I was expecting to see him much more than 11 times in 6 weeks. I know some people almost didnt see him yet even after all this time.