The max hunters are only about .1" taller than the blazers so clearance is not much of an issue. However, due to the shape of the vane the surface area increase by about 10%. They are slightly longer as well, again about .1" longer than the blazer. A couple things should be mentioned here, and will help explain the better groups people are experiencing. The ridges on the Max hunters grip the air better and cause them to spin, likewise, the stiffer material that are used on the max hunter make them more durable and help them spin and stabilize better as well. When testing with broadheads last summer I used 12 maxima blue streaks, 6 fletch with Max Hunters and 6 six fletched with blazers. Within 40 yards they were nearly identical in group size and point of impact. at 50-60 yards Point of impact was nearly the same, but groups began to open up. 70-100 yards blazers began dropping much more rapidly and groups really opened up. Max hunters are a far superior vane in my opinion. As a result of my testing and success with these vanes I have been changing our shop over from blazers to Max Hunters. All the fletching we do in the shop will have max hunters on them.