I think 2-3 drops per run is pretty bad considering the size of this uber, it should give at least 5 per run.
Ok, managed to do bremmtown with this build, here is what you need:
1 - Uldy charm with good +Edyrem life, doing that you can summon 10 Edyrem + merc and you will be able to survive the first jump which is crucial if you want 1:30, Toraja charm also helps with this.
2 - Laz charm with +damage to demons, with this the howling spirits will die much faster, allowing you to reach there in time.
Also consider getting Teleport from Void charm, it's much faster, not only on cooldown but also in the animation, you can also remove the +sps spent on Blink because the cooldown is the same and add them on other skill you need like Cloack or PB.