I don't shoot well enough to know the difference either. That is why I was asking.
Not between 55 and 60# on my bow.
I dropped down just below 60# for most of my hunting seson,and did fine.
IMO faster arrow speed is overrated. At least for the hunting I do with shots at deer no farher than 35 yds.
I pratice out to this dietance,and set this as my max.