Since increasing index finger pressure brings the apex of the string angle closer to the arrow, it should bring 3 under closer to split finger, with a reduction of noise. I have noticed that increasing pressure on my index finger and decreasing pressure on my ring finger allows me to reduce my nock point by approx 1/8" when shooting 3 under, as measured by the nocking point necessary to get level bare shaft flight. It is not natural for me to put extra pressure on my index finger, so I slip back into my normal string grip, which is more balanced, but your post makes me want to give it another try.