RE: Nocks too tight ???
For years, when I get a knock that is too tight, I insert the knock end of the arrow (knock in place obviously) into a saucepan of boiling water for a few seconds. \When the knock is well warmed, remove it from the water and repeatedly snap it onto and off of the string until it cools down.
In this way all my knocks have very much the same fit on the string.