I've analyzed my technique, and will try to explain the problem as I see it. It involves playing quick slap/pop passages. I mainly pop with my index, sometimes middle finger. My finger gets "stuck" underneath the string, and I cannot seem to recover, so the passage sounds rhythmically sloppy. My finger pops the string at a 45 degree angle. I use about one half inch of my fingertip underneath the string. I want these passages to sound seamless. This affects my thumb to, so, it sounds awkward and sloppy. Don't pop so hard, I know, but I need to get a good, confident, pop sound. Please, details on how to do it right?