Exchange 2007 Sender Reputation Filter and Puremessage

I would like to add one more layer of spam defense to our organization using the Exchange 2007 Sender Reputation filter.  I have Puremessage 3.1.2 installed on our Edge Transport and have enabled the Sender Reputation filter but after 48 hours there seems to be no IP's added to the block list within Exchange - although the JET database appears to be increasing in size....  I'm suspecting that the Puremessage agent has a higher priority than the "Protocol Analysis" agent and this is why I'm not seeing any blocked IP's - is this accurate or do i have something misconfigured? 

Is this possible to use both PME and the Exchagne Anti-Spam agents on the same box?  I should note that I checked our firewall logs as well and don't see the edge transport server performing any "Open Proxy" testing - I would imagine I should see attempts from telnet, port 80, etc to the destination host.

Any ideas?  Thanks!

[PS] C:\Windows\system32>get-transportagent

Identity                                                       Enabled         Priority
--------                                                         -------                 --------
PmE12Transport                                     True                 1
Connection Filtering Agent                    True                  2
Address Rewriting Inbound Agent       True                  3
Edge Rule Agent                                     True                  4
Content Filter Agent                                True                  5
Sender Id Agent                                       True                  6
Sender Filter Agent                                  True                 7
Recipient Filter Agent                              True                 8
Protocol Analysis Agent                          True                 9
Attachment Filtering Agent                     True                 1 0
Address Rewriting Outbound Agent    True                 11
PmE12Protocol                                       True                  12

[PS] C:\Windows\system32>get-transportpipeline

Event                                                                    TransportAgents
-----                                                                    ---------------
OnConnectEvent                                                           {Connection Filtering Agent, Protocol Analysis Agent, PmE12Protocol}
OnHeloCommand                                                            {}
OnEhloCommand                                                            {}
OnAuthCommand                                                            {}
OnEndOfAuthentication                                                    {}
OnMailCommand                                                            {Connection Filtering Agent, Sender Filter Agent}
OnRcptCommand                                                            {Connection Filtering Agent, Address Rewriting Inbound Agent, Recipi...
OnDataCommand                                                            {}
OnEndOfHeaders                                                           {Connection Filtering Agent, Address Rewriting Inbound Agent, Sender...
OnEndOfData                                                              {Edge Rule Agent, Content Filter Agent, Protocol Analysis Agent, Att...
OnHelpCommand                                                            {}
OnNoopCommand                                                            {}
OnReject                                                                 {Protocol Analysis Agent}
OnRsetCommand                                                            {Protocol Analysis Agent}
OnDisconnectEvent                                                        {Protocol Analysis Agent}
OnSubmittedMessage                                                       {PmE12Transport, Address Rewriting Outbound Agent}
OnResolvedMessage                                                        {}
OnRoutedMessage                                                          {PmE12Transport, Address Rewriting Outbound Agent}