RX8 Issues

Hi guys, I've been reading these forums for a while but finally made an account to get some help with an issue I'm having.

Im trying to figure out exactly whats causing my AFR to reach 20!
Ive changed my coils and spark plugs twice in less than 20,000kms (I've also bought BHR coils which I'm waiting to receive).

Initially i though it was a coil issue but after running some logs and looking at the results it seems as the issue is possibly related to something else. Currently my O2 sensor apparently has a stuck signal (so this could also be causing issues?)

From the provided log would the fuel pump be the most likely issue or am i missing something here?

I've narrowed down the possible causes of AFR hitting 20 from the items below.

-Fuel Pump
-Injectors
-MAF
-ESS
-Rear O2 sensor

Any help would greatly be appreciated. Ill be cleaning the MAF and ESS tomorrow or the day after to eliminate those possibilities as soon as i can.

edit additional info:
2004 SI RX8 Manual 177kw
run BP Ultimate 98 octane
Items below were done @ 81,000km car has now done 97,000kms
Engine rebuilt with steel apex seals
Excedy clutch
Replaced rear O2 sensor because the original had failed
Replaced CAT

I got the Steel apex seals etc because i was thinking of 'turboing' this car (but have decided against this haha)

Attached Files

trackLog-2015-Jun-13_21-29-12.zip (332.7 KB)