RE: 3 or 4 fletchings ?
I have always preferred the looks and the accuracy I have received with the 5" 3 fletch. I shoot trad and have not had any real problems with clearance with the 3. Can fletch 4 but have not seen any reason to use it.
I am in agreement with the others. I am not going to mess with what works.
A good amount of Helical really is what makes the difference in arrow stability. Shoot straight feathers and you will see that.