Network increased latency on influenced maps

I'm located in Singapore and play with friends on Frankfurt gateway.
When playing normal maps the latency is around 300ms which is expected but influenced maps increase this latency to 900ms and more with lag spikes and occasional disconnects. Heist and delve have no problems, it's as far as I see only when the map is influenced with conquerors.

My friends say that playing on the Singapore gateway does not have this problem.