i fletch my arrows with the 2" blazers. i use 3 blade muzzy broadheads, with great results. try a few kinds out to see what your bow likes. some don't shoot this setup well.
I too use this setup and they shoot great. For anyone making this change be sure to resight your bow, I didnt, and when I switched from the 4" to the 2" veins my bow shot so much faster that I was 5 inches high at 30 yrds and ended up grazing a does back this past season.
Just going from a 4" vane to a 2" Blazer should not increase your FPS on an arrow, other factors can attribute to this. Weight change ie going from a heavier broadhead to a lighter one. Arrow shaft weight changes can cause a faster FPS in your arrow speed and cause either higher or lower flight as a result. Just this past week I tried a friends Carbon Express Maxima 3D Selects, his arrows weight is 365 gr with his 85-gr target tip, I shoot Easton Axis FMJ 340's with a 125-gr target tip and my arrows weigh in at 487.7 gr. When I shot his arrows, at 20 and 30 yards I was dead center but 7 inches high, and when I shot mine I was dead center X at those yardages.
I have found that some bowhunters did not practice with the same weight field tip, as the grain weight of their broadheads to be another problem. Not practicing with a practice broadhead will almost in every case cause your arrow to fly differantly than intended.
My own brother in law went from shooting K-Mart specials (Black Aluminum Shaft) to Carbon Express 4560's from the bulk section at Wal-Mart and did not practice with them, and then wondered why he could not accurately hit what he was shooting at. He had failed to re-sight his bow, and worse of all, he had failed to
dedicate his time in practicing with his bow.
Another reason for hitting an animal high on the shot is because when in a stand, your body position was incorrect when shooting. If you were not bent at the waist when taking the shot your could have hit higher because of this ie scaping the does back for instance. Shooting down hill will cause you to hit high on your target, again if your not bent at the waist, you will hit high.
Another reason could be just miss judging yardage, and not putting enough practice in your archery. Many bowhunters don't put in alot of practice for the hunt. They hit the range maybe a couple of weeks prior to bowhunting season, and call it good. This results in poorly placed arrows into the game they are hunting and or total misses all together.