I have some Easton Ecel Carbonaeros. 400 spine I have some that are 27, 27.5 and 28. I know these are too weak. Right now they are fletched with 3 inch vanetecs. If I fletch them with 4 inch Vanetecs will they act stiffer and fly a fixed blade better? I just learned what FOC was and will the change screw this up. Sorry for all the questions.