Don't over-estimate the "Zeusing" that's happening. The mission is already fairly tough and I only tend to Zeus in counter-attacks.
E.g. in yesterday's session (from 21:00 to 02:00am, roughly) I did not Zeus in a single unit at the Russian HQ.
I only started putting a few additional units into the north-western valley (within 250m of the cache) once the Merlin had been found/secured and I realized that I needed to pull Alpha and Bravo apart again.
The first contacts that Alpha took when pushing north weren't even 'zeused' units, but units that the missions spawned in. (the 3 BMPs were my work, though

)
I'd like to think that we had a great mission because the section commanders did some great work keeping their sections alive which resulted in few respawns which resulted in supplies going low which is one of the biggest "tension builders" in a session like this.
I also intentionally positioned/ordered alpha/bravo so that they'd be in the same AO but in separate fights (unable to support each other with fires).

Once Alpha and Bravo were getting too close (Blu-on-blu in the town SW of the airfield) I realized the airfield wouldn't keep two full sections busy any longer (btw: I can't see default mission russians in Zeus, so I made that call based on duration of OP, observation of the airfield from my hill and sitreps from section commanders, not some magic Zeus-knowledge).
I then went and spawned in (for the first time in the session) 4-5 fireteams and 3 mechanized BMP sections NW of the cache location. I placed the infantry all over the place and told the BMP's to head south-east towards the airfield.
With that done I tasked Alpha with pushing up towards the cache location.
I then made another "oh, this airfield is no longer any fun" call when the merlin was re-fueled. Even though the Merlin was the mission objective and it had ALL our pilots in it I decided to use it to send Bravo up and around to the North were they would be able to push into the same valley that Alpha was attacking, just from the other side (again, both sections in same AO but not able to effectively cover each other).
When we RTB'ed, I had only used the Zeus spawn function once (5FT's, 3BMP sections) as mentioned above. After the RTB, for our "midnight madness" OP I did spawn in a few (ok, maybe a TON) of additional units into the military compound xD
Alpha got lucky and ended up walking past 'their' 5 sections (they were just the west of the LZ) but Bravo really hit the hornet's nest.