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 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 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.