Apologies for the delay and glad Jeff came to rescue.
For future reference, you can see the inbalance on the output with # active vbuckets on one node vs the other. That points out the great imbalance of vbucket distribution which points to rebalance issues.
You can also detect this in the couchbase web ui through the vbucket distribution - reported under active vbucket per server graph.
Thanks
-cihan