I have increased the request time out parameter for import job to 600000 , still the jobs are failing for larger files.we also tried using Abort if struck plugin for this. However it also failed to yield any result.
Please help us with Load balancer parameters to be set for increasing the time for time out , as it was mentioned as solution in the link provided in your message.
I am not aware of the load balancer parameters, i think in the other post user resolved it by testing the functionality in the lower environment where he doesn't have the load balancer. May be you can try the same to make sure if its the issue with load balancer configuration.