I started using Achilles and in their settings one can disable selected factions. Among them I see Goa'uld faction under... BLUFOR. Though they show up as an OPFOR in Zeus anyway.

I think something may be wrong with the setup of faction. When I tried to use MCC4 Sandbox for generating mission it works great on vanilla Arma, but in case of Goa'uld faction as rivals for the BLUFOR, it creates groups of Jaffa then they simply kill each other among the squads. I think they are assigned properly to the OPFOR, but consider each other to be BLUFOR for a reason. Same happens when I use "spawn" function of MCC.

Can you double check if all settings for Goa'uld faction are fine? I wish I could generate and then modify missions with MCC, which is soooooo faster than simply in the editor.

I can provide reproduction steps for the issue if necessary.