The arrows I'm talking about are 29" Gold Tip 5570 Hunter Arrows with 3 4" offset vanes . I use 100 grain field points. My bow is set at 56lbs and have 28 inch draw length. I'm right on the edge of the arrow spine recommendation but I didn't want it underspined so that's why I went with the 5570s. Any advice? Will blazer vanes be better than the 4" ones? Or would putting 4" feathers on help a lot? I'd like to shoot blazers but if they won't perform well for me that may not be in my best interest.