Playing pop-slap style I've got a problem when popping. Let me give you an example as it will be easier to tell my problem: When I'm popping the D string, the back of my index finger, right where the nail ends and the skin begins (sorry but it's hard to explain) touches the G string and after a while it aches/hurts a lot and I usually have to stop popping. The skin there becomes red and thicker. I wish it's clear what I try to tell, so what is my error? First and only thing that comes to my mind is that the angle of my index finger to the body of the bass is wrong and by making my index finger tip more perpendicular to the body, I can eliminate touching to one higher string. But in this case the popping becomes less powerful or not so "a la pop style" at all.. It becomes more achefull when I'm making double pop - simultaneously the G and D string (middle finger popping G and index finger D) - as the angle of my index finger becomes more and more ..hmmmm what to call.. wrong.