This sort of ties into an overhaul of the squad system, but first make squads of equal size. Make it easier for squads to stay together and incentivise it.
For asymmetry, give the US static spawn points, but give the VC deployableable and destroyable ones. This would simulate the never ending struggle to locate the VC and enhance their ability to seemingly attack out of nowhere. If deployable points aren't possible, giving the VC many more spawn options via tunnels or spider holes would also work.
I'm never for spawn on SL, but this always gets shot down, so I would say give the VC a small advantage in respawn time to simulate the problem the US had in always having to take the fight to the enemy.
Give the commanders the ability to draw or place markers on universal maps to aid with squad and spawnpoint placement as well as where to set booby traps, and ambushes.
Give the VC a small advantage in time at the start of the map to set up as well. A 30 second head start?