Concurrency test issues for 7.7 release - round 3

We did concurrency tests in two session
Session 1 - With proper setup, it start fine. But it was very slow & there were some issue specific to certain channels,
Issues
Unable to delete banner in Chinese website (Unico)
Unable to drag drop components in Dutch site (Simon)
Unable to publish changes in Dutch site (Simon
Consistency issues, changes made in one node was not reflected in other node (Ard & Mathijs)
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With above issue we decided to attach java profiler (yourkit) to monitor in better way
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Session 2 - With same setup as above + your kit. But the load balancer setup failed and all the requests were diverted to single node
Issues
Chinese URL was not working in one session and was working in other session
Issues with preview mount
A dragged and dropped component disappeared, but reappeared when publishing (Simon)
When making changes in the template: "Store page error, your page will be reloaded..." (Simon)
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Logs of each session named with respective conventions - for example c3n2s1 denotes concurrency test 3, node 2, session 1