I will say that bigbulls is right on the money. In the last month, I, too, have been messing around trying to get muzzy to fly correctly. I am shooting the 100 gr, 4 blade variety. After MUCH trial and error, I found that I just could not get absolutely all of the wobble out of the arrow. I spun the nock, everything. So, I got it to as close as I could get and started playing with different fletch combos. I found that a 4" feather, fletched on about a 9 degree helical will get the job done. They fly very straight, and flatter too.