How many of you shoot with a whisker biscuit? I was thinking of getting one because every once and a while when I pull back the arrow jumps around on my fall away rest. Not to often though. But when hunting, and I'm hanging on to my bow, I knock it off the rest. How often do you have to change the whisker?? and how much does it affect the arrow speed and fletching??? I know its the wrong time of year to be changing my rest, but if I do it today, I have two days to practice before opening day Saturday...