There are ways to make the inital part quicker.
Here's what we do,
Our scout tank and 1 dps go into the tower, DPS kills the add and then begins scouting for the big droid while the tank is still scouting squares. After scouting the droid, the DPS joins the fight. This cuts roughly 30-40 secs off the fight. Also make sure your not running the right side squares right into the wall, there almost always is another way to go.