This is from the Black Widow website under frequently asked questions. I realize it is the opposite of your situation, but the end answer is still the same. You will probably not need a higher nock point or have any additional noise going from 3 under tiller to split finger shooting though.
Q: “My bow has standard tiller. Can I shoot it 3 fingers under?”
A: Yes. You will not damage the bow. It may require a higher nock height and may make your bow a little louder. There is a 1/8" difference in standard tiller and 3 fingers under. Most bows, people can shoot either way.