Seaside did this very well. Going trough CT Spawn is very fast but disadvantegous in both sites, and it allowed to take the longer route and attack the sites from different locations (tought this applies to other maps, Dust II going through tunnels comes to mind). For example, in your map, you could have the fast rotation in mid but instead of giving CT's a hard chokepoint you could just leave angles from T Mid so its already risky. But then again, if you do that, you would have to balance the routes to the sites or give the CT's the advantage in Mid because the middle route is rewarding for the T's after taking it.
GL with the map!