RE: Two, three, or four blade
Whether or not you can line up the blades with the fletchings is irrelevant. It makes absolutely no difference. Two blades are asier to tune because they have less surface area for air to push on. I'd rather have a slice that went all he way through than a hole that stopped half-way. I shoot steel-force sabre-tooths and I think they're great. I've never shot magnuses but everyone I know who has loves them.
TJ