DC servo adjustment question

Hi everyone,

I have a Plinius Odeon amplifier with 6 individual modular amplifier boards, but this question is probably more generally.
The instructions say

Check the right DC servo is set within its operating window.
Use VR2 to set TP5 to within –3.0 to +3.0 volts.

This seems to be a big range to me, so my question is - it is ok as long as the voltage is within this range?
I have checked the boards and most are within the range with 1 way outside.
Should I be adjusting them all to be as close as possible? Or is it ok for amp to be -2.5V and another to be +2.8V?

TIA