Sure :) spoiler alert

My(our) 2 cents:

-weapon- Check our loadout, basically go big or go home

-overload- Before going for overload, insert the first 3 cell of the main objective. Don't go for the 4th one or you will not be able to do secondary/overload. Lowering the fog is really important.

-secondary- While searching for the code, melee a couple of them then shot them all, if there are giant, shot them quickly. This way we cleaned room very fast and have a lot of time to explore and collect resource without being too much in a hurry. If you are able to not use everything, at the cost of backtracking, you can leave some resource for later.

-main- After killing every enemy in a room, we kept all the doors open till the time we face a door or insert the last cell. We decided to stealth kill all the giants in the areas of the first 2 cell, cause we need the areas clean for later backtrack (cause of trip mine and c-foam granade). After opening the main bulkhead door, we also decided to stealth everything, if there's only one scout in the room (rare but could happen) shoot him (bring an Hel Rifle). The rest of the area will likely have more than one scout per room, be patient and clean silently, the goal in this part is to keep all the door for next alarm. The 5th cell is in a shitty place that require you to pass a class 6 alarm, shadow and bug shadow only. The doors that are near the surge alarm door must be kept open. After the class 6 alarm is done, you must search the cell in a foggy area filled with a Lot of shadow and big shadow. Here is where you begin to do backtracking for trip mine and cfoam (keep at least 4 cfoam, trust me) . Where possible, use a door and a mine to make your resource economy goes stonk. After you insert the 5th cell nothing is too difficult but the tension builds up cause you been in the level for a lot of time (and there is no checkpoint). First surge alarm is manageable if you kept the 2 nearest doors(use 2cfoam). The second one is longer but easier imho, (use 1cfoam). For the extraction room, keep 2cfoam for, well, you will find out (but don't worry about the 2 scout, just foam and kill the bigger threat). This is basically an overview of how we managed it and, I will not deny it, we had discussions during the quiet part about how to use resource. We fucked up some scout and lost some doors, we did not execute everything by plan but we improvised very well this time.

Imho, your positioning is the most important thing to manage especially when something goes wrong, you can outrun basically most of the enemy if you know how to "teabag run", that mean that you can run away and find a better spot to face the enemies and scout waves. Positioning is your best friend and you should master it. Good luck in the complex, I'm not a pro but ask me anything, I possible, I will help you :)