I have now tested both the 30 A Afro ESCs and iPeak 40A.
The smaller ocoto HFP setup with the Afro ESC flew smooth.
My Droidworx WK-M flew perfectly smooth with the iPeak 40A ESCs. I have never had it fly this smooth but then again that may not be the ESCs per se but having the electronics finally working properly. The cost is that it took two years and two burned out Axi motors, 8 ESCs, totally rewired at least 3 times, checked and double checked connections, pain suffering, anguish, etc. etc. You never want to crash.
I think in the end the Achilles heal of the this build was a bad recommendation from DJI about initial gain settings. I believe that the gain was way too high when we first tested the ship and after the initial crash I assumed the problems was an electrical/connection problem. I think the crashes caused most of the lingering problems (bad connections, bad ESCs, bare wires, etc.). I have no idea why the latest AXI motor burned out - I checked all the connections and those seemed fine.
I hope it continues to fly well. The down side of the Droidworx build is that it weighs a lot so we won't get much flight time. For instance, I noticed I had it just above mid-stick in order to hover but that is without a camera. The weight of this ship and all electronics is probably close to the smaller ocoto (HFP) with a camera. It will be interesting to see how much flight time we actually get with it.
We will have to do more testing but so far these ESCs look promising.