We did a few incursions last night (lvl 123). Our most successful runs were done with WHM BRD SAM SAM SAM MNK, though I'm sure any good DD's would work. Basic strategy was to get close enough to a group of enemies for a few of them to notice us and then pull them back, have the BRD sleep them and take them out 1 by 1. Rinse, repeat. For NM's, probably best to have 1 person hold the NM as they can't be slept and treat the adds similarly to any other pull. We tried using PLD but with the initial hate being so random and the normal enemies die relatively quickly, PLD probably can't effectively supertank and not much point in holding the peons. I can see its usefulness on the NM's, but I'm not certain it's worth bring PLD just for those.
In other news, the map appears to follow this:
http://www.bg-wiki.com/bg/File:Cirdascomposite.jpg
I didn't have too much time to play yesterday, but I now that one NM spawns near the top, in the room to the right of the uppermost loop room (Muyingwa's room). Another spawns on the far east side of the map - I'm not sure which chamber, however it is most likely one of the northern ones. Unfortunately I wasn't able to pin down where you start either, so this information may not be as useful until that's determined. I believe it's somewhere in the upper portion of the map, possibly near the horizontal center. If anyone has more information on this or wants to do some research we could probably come up with a decent map (I'll be at work most of the day...)
Or if there is already a marked map and I've just been wasting my time, I'd love to see that as well.