SNMP OIDs for monitoring

I am trying to get the correct OIDs for monitoring F5s CPU, memory, disk Partition and power. We tried snmpwalk for 

UCD-SNMP-MIB:ssCpuSystem  and ssCpuUser and did not get a response on R-series F5 using snmpwalk/OPmanager.

Can someone please let me know the correct OIDs for F5OS R series host and Tenants and iSeries F5s

 Is sysMultiHostCpuUsageRatio5s and sysTmmStatTmUsageRatio5s from System MIB correct for CPU?

 I am being told they see 98%, but its not 98.

What is the OID for TMM CPU and Memory. What to monitor to get High CPU Load

Thanks