Kev. If your 2219's are faster then the 2413's the stiffer shaft is closer to perfectly tuned than the lighter. The smaller diameter of the 2219 changes the center shot, nock set height by .002 and of course the spine or deflection. The 2219's are coming off the rest perfectly where the lighter, 2413's are correcting before perfect flight is attained. The adjustment in center shot and nock set height for a perfectly clean release is minute. Just one twist of the nock set on the serving or 1/16" in center shot can make a big difference in arrow flight. I would suggest you adjust your nock set up just 1/2 to 1 turn on the serving. This should adjust for the .002 in arrow diameter.