I am toying with the idea of a new hallway between point 1 and 2.
Or
just provide a couple of alternate paths
Or
close off some of the access points to red via gates that close "on pass"
It's a real pain in the ass to keep having to fight red on the 2nd floor above the main gate when their access to that floor should be cut off or limited so that red has to run accross the bridge to get there instead of just running up that staircase. This is by far the easiest fix you to do for 100% improvement for the game play.
It's a little rediculous to have the cart turning the corner and stll have the main battle happening back at the main gate to the building - once blue has capped it they should have capped it.
By doing this you force red and blue to be having the big battle back at the corner where the cart is instead of the main gate.
You could elonggate the stair case area so it's longer path to the stairs (but still gate it off) and then it gives room for red engies to build their gear in there. Then they could teleport in to have the fight and still cause havoc near the main gate and alternatively - if blue can take that area it can help them take that corner - blue teleports into battle faster can get better defences up - forces red to attack blue not just defend the point. Gives both red and blue a reason to control that area using engines instead of them all building in the attic.
But most importantly - it keeps the pressure up on both teams to be fighing near the cart - wehre it should be.