Unless you are experiencing breaks with your Cure 3+ bolt then the Cure 4 really isn't necessary. I have both as they came with my CSL and I dont really feel a need to use the 4 unless I am shooting very brittle paint on a chilly day.
I wouldn't even bother with the Techt bolts either to be honest. The Cure 3+ is more than good enough
"You are entitled to your own opinion but not your own facts" ~ POTUS