I want the map to stay roughly the same as much as possible so here's what I did:
*Note* I'm not a very good optimizer myself so this may not be any help at all *end note*
Basically I've just moved the middle part up along with the mountain so that It blocks vis from base to base.
tunnel area would have to be disconnected from the bridges since the distance got to great (It's just a great way to get lost if it stays).
Respawns needs to be moved closer to the bridge area so that the tunnel stays as a secondary route and not become the main passage.
Small house moved so scouts can double jump to the hangar roof.
Billboard moved to prevent sniping into the base.
White lines represent hint brushes. The 3 white "???" Symbolize my ability to judge whether this is a good idea or not.
I just don't want this map to become too large again, which I think it will with the L shape idea (that also makes the tunnel the shortest route..)