Increasing spawn size/massive ambushes?

I am trying to figure out how to make the spawns larger in my arcs or to have very large ambushes come rushing towards the player from time to time during a mission.

I played one arc (sorry, can't remember the name) a week or so ago that, for a single player on maximum difficulty, would spawn 3-6 LT's per spawn, and would have really large hordes of LT's (12 or so?) come SPRINTING at me every minute or so, even if I hadn't done anything.

I don't think those are patrols - they move too fast, and every patrol I've put in seems to just meander (and more or less ignore). Are they ambushes? If so, how do you get them to spawn seemingly without any mission objective being completed, and how do you get them to make such large spawns? Kicking them to "Hard" only gives me 3 LTs.

Is the map used somehow a factor?

Please help - the all-out super-duper crazy carnage mission depends on it!

Might work if you do max defend objects for map, set difficulty to hard, trigger an ambush for each object to defend, and set those to hard.

Otherwise, look for fill.

[ QUOTE ]
Might work if you do max defend objects for map, set difficulty to hard, trigger an ambush for each object to defend, and set those to hard.

Otherwise, look for fill.

[/ QUOTE ]

Adding to this you could put a little boss, one that they don't know of in the middle of the mission and have there ambushes set on hard to go off when boss gets down in hp. Also you could do this with three other bosses but only one ambush, might just be me but i notice you can only have 3 ambushes.

I would love it if we could have an ambush trigger an ambush, like in the "get the loot" missions.

What I do is have kill boss objectives, then have an ambush trigger on those and add max patrols.