One trick I use to work around high ping is to press a skill, any skill, usually one on CD, to force another packet out as soon as I clear the AoE.

I'm not sure why or how this works, but I guess that extra bit of info saying "you tried and fail to use this skill while standing here verses the danger zone," sent back to me often works to force the server to see that yes, I stepped out of the AoE in time and tried to do something else.

The fact it's gotten bad again is most likely server congestion and the move, but this has always been an issue.