Yes you are way underspined. For a 70lb draw you would need to cut your 2216's down to 27" to get a proper spine with a 100 grain point. For a 30" arrow at 70lb, you'd need either a 2512, 2514, or a 2317. That's with a 100 grain point...a 125 grain point changes it to 2514, 2613, 2317, and 2419.