It is finally done and the data gathered above most likely obsolete by now. I ended up with a good bit less than the anticipated 100k kills. After the VU which introduced the Looter profession, drop rate for the rare wings has increased by 50-80% for me, some runs yielded twice as many as before. At just under 3000 (wings, not kills) to go, there is some sample size gathered on this side now also. I can't say for sure whether it has to do with the new profession, since there could be other changes under the hood. But evidence taken at face value, it might hint at Looter working in a similar fashion as Evader, i.e. it's the ratio of your level to mob level determining your chance for better loot quality (not quantity - overall returns were rather bad lately). I got started with level 15 in Looter and we have a L1 mob here so if the mechanism is as suggested, it should work out for everyone. Good luck to all who go about this in the future. It's the cheapest 100 stamina tokens you can get in the universe, not counted the value of your time of course.