I wouldn't hold your breath for any further fixes, although it would be wonderful if they improve it. We have to learn to work around the problem by moving before the cast begins. You can either do this by being constantly on the move or memorizing the attack patterns so that you know a second or so before the cast begins to start moving.

For people with over 200ms latency a good guideline is: if you can see the red circle and you are not already moving, you're dead.
You are pretty much right here.
Especially since the servers don't seem to handle the load and tend to lag as well adding even more delays on top of it.
If anything the last maintenance made it worse for me with the constant lag spikes during peak hours.

But here is the main question, does the majority of the players want to do end game when this is the set standard?