Choosing the right MPU for your connection on SQM

Hey yall. This is probably a dumb question but I’m just trying to dig into this to see if maybe it makes a difference with SQM. I’m on a fiber connection of 1Gig up and down. I see that for overhead for fiber when tuning sqm should be set to 44, correct? Now for the mpu what could possibly be good valid values to use for a connection like this. 64? 84? 96?? I would like to hear some of your guys opinions. Thanks.

The documentation:

says 84: