Well, I shoot Wasp SharpShooters and they have 4 blades. My Gold Tip Arrows have 3 Blazer vanes. I shoot just fine so I don't think it matters.

I know of one hunter that aligns his broadheads either matching with the vanes or completely opposite the vanes. He hunts with a 3 blade broadhead. He says it makes a difference.

I don't know, I have never had any problem filling the freezer every year.