soundman -
Like everything else, finger position is archery isn't random. With split finger. try starting with your middle finger LIGHTLY touching the arrow nock and your index finger about 1/4" above the nock. As you draw, the string angle will collpase your fingers onto the nock, but not with enough pressure to disturb the arrow or hurt your fingers.
Another reason for finger pressure is that there's rotational torque between your hand and the string. More simply, you're twisting the string and pushing your fringers into the arrow nock - Don't do that!!!
Also make sure you're using a deep hook, meaning that the string is actually in the crease of thr first joint or deeper and NOT on the finger tips.
Hope that helped.
Viper1 out.