I have decided to give fixed blade heads a try after using mechanicals and have decided on Muzzy' s. I am going to be shooting a 100 grain head, the question I have is what are the advantages and or disadvantages between the 3 blade and the 4 blade versions. In other words tell me why you use the 3 blade version or the 4 blade version. Do you have more problems getting the 4 blades to tune over the 3 blade versions because of the extra blade?