I'm running my two D3's on 400 Mhz, Voltage 2 and 20% Fanspeed.
So i have nearly 15 GH/s per miner and this is also shown in the antpool dashboard 30 GH/s +/- 3 GH/s so i have no Problems.
I also tried to run them on zpool over night and there i get max 20 GH/s, so i went back to antpool where i can use the full hashrate.
Go on with the good work blissz, love to see how this firmware and my D3's are getting better and better

Greetings from Germany
Take a look at this pool too.. I like the nice overview.
I have the same setup as you (400mhz at voltage 1 though) and get 1-1 on hashrate on the pool as in the mining software.. So it should be alright also.

I'm also VERY happy with this firmware..

650W at the wall and fans running at below 2000RPM all the time

Greetings from Denmark.