I took the car for a drive to go buy a compressor. This time with coil 1 and 5 swapped. Recorded data during the trip there and during the return trip. Bank1 O2 levels were still very consistent and bank 2 still showed misfires although not as sever as before. I attached the graph of the return trip, recording started just after starting the car in it was still in high idle. Bank 2 is running leaner than bank 1 and fluctuates too much.
I cleaned out the engine with compressed air and removed all the coils for cleaning and inspection as well as the plugs on cylinder 5. All the coils looked good except for the one originally on cylinder 5. This one's low voltage connector as well as the plug connector were covered in thick oil. Upon removing the wires leading from the coil to one of the plugs I saw that in stead of a nice copper pin there is only blue dust inside. The copper pins has completely disintegrated on the wire, see pictures in the attached links.
The plugs on cylinder 5 are also still very good, see attached pictures.
I also removed a plug from cylinder 1 for comparison with one the of cylinder 5 plugs.
I am going to replace coil5 and the corroded cable on monday and test again. I still suspect the injector as the car did drive better today and from the data I could see the dips in bank 2 O2 levels were less severe than before.
Coil pack connection corroded:
https://www.dropbox.com/s/xts9ev8twbruwi0/20140201_155114.jpg
https://www.dropbox.com/s/mjte9ntrrypm0kt/20140201_154958.jpg
https://www.dropbox.com/s/ll2eysjzn0ysxx6/20140201_154939.jpg
https://www.dropbox.com/s/tau29qe5p8tt20b/20140201_154846.jpg
Plug a and b from cylinder 5:
https://www.dropbox.com/s/jrqplbmsq0sku21/20140201_162201.jpg
Cylinder 1 plug(top) compared to cylinder 5 pulg(bottom)
https://www.dropbox.com/s/ry2a6yxq1r3in8z/20140201_162606.jpg