So we played this map in an impromptu last night (the first time I've ever hosted an imp, woo!) and everyone agreed that the map is huuuge and extremely open, and the routes connecting (ha) the capture areas were extremely cramped and also somewhat lacking in lighting. Long story short, half the server started playing as Snipers, everyone else got kinda distracted from the objectives (in half an hour, we only completed two rounds) and the whole affair was simply not fun at all.
Honestly, you may want to just scrap this project and start a new one. It'll be much easier than cutting this one up, shrinking it, and stitching it back together... (can confirm, I've done it before and it was a nightmare.)