Alright so I've been working on the Excavation tactics as asked, this is waht i've come up with.
So for the begining- All four or how many players go con. We stay in a tight train formation and let one take flag there is one high lead one normal lead and one staying a bit behind him for meat sheild. This tactic will work once or twice per match.
If the enemy Hevs- One guard, one lance, one med go up the side they are camping and nade when all hell brakes lose a con that went in, takes the flag and hopefully we can get everyone on the opposing team dead.
There is obviously camping - Assault camp, spawn camp but thats not what you asked me to come up with, here are home grown ideas that i came up with atleast that i've never seen.