Fix Regression in Workload A, 3 nodes, 12 vCPU, replicateTo=1

Avg Throughput (ops/sec), Workload A, 3 nodes, 12 vCPU, replicateTo=1
6.5.0-4960 - 135377
1023: http://perf.jenkins.couchbase.com/job/hebe/5769/ - 55594
1022: http://perf.jenkins.couchbase.com/job/hebe/5772/ - 115300
http://cbmonitor.sc.couchbase.com/reports/html/?snapshot=hebe_700-1023_access_5271&snapshot=hebe_700-1022_access_67b8
1022 Logs:
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-hebe-5772/172.23.100.190.zip
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-hebe-5772/172.23.100.191.zip
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-hebe-5772/172.23.100.192.zip
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-hebe-5772/172.23.100.193.zip
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-hebe-5772/172.23.100.204.zip
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-hebe-5772/172.23.100.205.zip
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-hebe-5772/172.23.100.206.zip
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-hebe-5772/172.23.100.207.zip
1023 Logs:
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-hebe-5769/172.23.100.190.zip
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-hebe-5769/172.23.100.191.zip
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-hebe-5769/172.23.100.192.zip
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-hebe-5769/172.23.100.193.zip
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-hebe-5769/172.23.100.204.zip
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-hebe-5769/172.23.100.205.zip
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-hebe-5769/172.23.100.206.zip
https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-hebe-5769/172.23.100.207.zip

I have run on build 7.0.0-1534 and achieved 81877
http://perf.jenkins.couchbase.com/job/hebe/6151/
So the regression remains has improved from 55K but still below the 115K.