Boy. I've been balancing a mission on FATA for what feels like forever now. :) It's been fun and I love the map but it hasn't been an easy task. Some updates:
I'm beginning to feel like having a BLUFOR civ obj module in any form is just overkill. Even with a small initial force (Platoon 30), they seem to constantly pepper the three large cities and regardless of initial OPFOR strength, the map feels just too barren for the first two or so hours from mission start (BLUFOR civ obj units just wiped the floor clean in the early going) . It probably doesn't help matters that my base in on the south east edge, making the map feel even more empty because the closest outskirts village which my civ Platoon isn't focused on (where the insurgency tends to start) is several (empty) kilometers away.
What I'm thinking of doing now is using a BLUFOR mil obj module instead (I have one now, but I only allow it 15 units), increasing the platoon size, and instead having them focus on the random camps in the hills, with a custom obj module in the cities so they can occasionally patrol the urban areas too. Without taking this approach, I just don't see any epic CQB battles happening in the larger cities at all.
For OPFOR, I've noticed with anything less than around 100 inital units, it's still far too easy to travel around without much resistance. But once you hit 100+, beware! No transport or CAS chopper is safe and every moment in the air is a nerve wracking one thanks to CAF RPG guys. I'm getting shot down a lot now, especially if I push my luck and try to fly to deep within the towns.
I'm still finding it cumbersome getting any OPFOR patrols in the valleys between the villages outside the main cities. The countryside has random camps (which is great) but the walk from the city to the nearby villages on the right side of the cities is still kind of a snooze-fest.
Anyway, right now I'm thinking of having BLUFOR limited to 60 units (mil obj only), with their focus on the OPFOR camps. The playable units consist of two squads; a 10 man infantry team doing mostly recon and a 7 man sniper team which will be used for C2ISTAR and installation breaching.
OPFOR currently has 130 units, 100 being civ and 30 being mil set only to spawn random camps. I'd still love to get some feedback from FATA mission makers but realize this thread is a little old now. This is a tough map to balance and makes palaces like Reshmaan and Takistan with their symmetry and small hills seem like a mission making breeze by comparison.
EDIT: I'm not discounting this approach may be overkill and *could* set me at an unrecoverable disadvantage after 5-6 hours as the insurgency grows. It's just the first 2 hours are so slow and empty I don't see how I can share this mission with anyone and expect them to enjoy themselves unless I take an approach like this. Definitely open to ideas though! Lots of good ones already in here. I just need to polish this up a bit.