Don't know more about V6 than what's discribed at e-on.

I'm surprised about your network rendering not being reliable. There were issues with the previous update, but apparently, they have fixed it. Haven't tried it myself yet, though. Do you run the latest upadte? 5.11-02?

Your solution about making the renders bigger is a good one, imho, but I don't know if it will remove the flickering. If it does, many here would love to know all about it.