First, with a 3 Under hook, move your nocking locator up to 3/4 inch.
Second, try to learn to deep hook the string. String into the first joint of the fingers from the tips of the fingers, String pressure MOSTLY on the index and middle fingers and less pressure on the ring finger. String should NOT be on the finger tips!!!
Finger position is the index finger JUST under the arrow nock.
Arne