Throughput is not restored with rb2out on memcached bucket

ops/s is reduced by almost half and not restored. Lot of node unavailable errors on rebound.

Phase timings for RAMP
Ops/Sec: 1791
[85997] OK: 85997, ERR: 0

{[OK]: 85997}

MIN: 0, MAX: 321, AVG: 2

Phase timings for CHANGE
Ops/Sec: 1839
[1910] OK: 1839, ERR: 71

{[OK]: 1839, [Error:0x199]: 40, [Error:0x400]: 31}

MIN: 0, MAX: 88, AVG: 3

Phase timings for REBOUND
Ops/Sec: 973
[165889] OK: 87639, ERR: 78250

{[OK]: 87639, [Error:0x199]: 107, [Error:0x400]: 78143}

MIN: 0, MAX: 12526, AVG: 161