RE: 3 or 4 fletchings ?
I would also say not to trust that advice that you got. I used to be a big believer in four fletched, but recently went back to three 5 inch feathers with fixed broadheads. To tell you the truth, there really was not any real noticable difference between the two except for a little increased arrow speed with the three fletched due to reduced drag. I guess I could say tuning is a bit easier with the three flethced probably due to a better FOC and less contact issues (and that was with a drop away).