Performance Monitors for F5 LTM 1500

I've created a F5 BigIP LTM Device in OpManager and was able to get it added as a device. I'm trying to configure Performance Monitors so that I can make use of the MIB provided by F5. However, it appears that none of the Monitors are able to retrieve data. I ran a tcpdump on the F5 for this snmp traffic and I get Requests and Responses such as:

17:14:58.502782 192.168.2.8.44494 > 192.168.2.1.snmp: C=***** GetRequest(33) E:3375.2.1.3.1.2.1.3 (DF)
17:14:58.551630 192.168.2.1.snmp > 192.168.2.8.44494: C=***** GetResponse(33) E:3375.2.1.3.1.2.1.3=[noSuchInstance] (DF)

but using the same tcpdump, if I run snmpwalk from the same server that has opManager installed:

17:16:52.616097 192.168.2.8.40650 > 192.168.2.1.snmp: C=***** GetNextRequest(34) E:3375.2.1.3.1.2.1.3 (DF)
17:16:52.669342 192.168.2.1.snmp > 192.168.2.8.40650: C=***** GetResponse(37) E:3375.2.1.3.1.2.1.3.1=6360 (DF)

Is there any way to adjust OpManager to structure the request differently so that it can properly query the LTM?

Thanks,
Lone