There is a point at which service aggression is just right to achieve the highest point scoring (breakpoint) percentage, but it varies.
A fellow blogger took a lengthy look at scoring points in streaks in the volleyball and how it relates to the outcome of sets. I have my thoughts on the subject.
It's time to put in your line-up. Do you set it to put your best server(s) first in the rotation? Or are there other possible considerations that are more important?
In the 2016 men's NCAA volleyball finals it looked like a conservative serving strategy ended up backfiring pretty badly.