Don't make the same mistake I made and get the wrong arrows. You are right on the edge, so go with the 5575 (stiffer spine) for sure. It will also be a more consistant arrow spine for you and increase your accuracy some. I'm on the edge of a .340 spine and a .300 spine. I look forward to getting my .300 spine arrows. Always favor the stiffer spine, I learned this the hard way.