It is hard to read and interpret neutral PI's, you have to look at how they effect your penis over-all (higher EQ, lower EQ, increase in size, decrease in size etc.) and then you can decide whether it's good or bad you haven't seen them!
Make sure you do use that light grip and don't jelq at too high an erection, 70% max! You do want the higher erection levels for girth but DO NOT jelq passed this level or you will damage yourself.
I know you asked hairtrigger but
here is a link to balooning.
Hope that helps,
LookAlive