back on topic, I have the same problem with the evolutions. I have 2 750s and both start in reverse. They sent me replacement things the props sit on, but they were exactly the same as what I had.
Therewas a knob in the screenthat the prop would hit when it started, I removed it on both power heads because it created an annoying buzzing sound. I don't know if it was there for shipping or if it was meant to help the props start the right direction. My resolution now is to not stop them. And if they do stop and start in reverse, I pull the cover off while they're running, grab the prop and stop it and push it in the opposite direction. It then takes off on it's own in the right direction.
The last communication I had with Koralia was to send one of the powerheads to them after sending several pics and they claim it looks fine and I shouldn't be having issues.
Problem is, I need the powerhead... So, I haven't sent it in. They didn't offer to send me a replacement, just said send us one...
So, let me know what you find out!