CEL still flashing

[huskar3399]

i wonder why and what others to check because my CEL still flashing after several related replacements made. below are the things changed.MAFx2 pre-cat o2 sensorsx6 ignition coilsCCV complete with all 4 hosesscanner shows deviation too rich and indicates post-cat o2 sensors for both banks got faulty. i wonder the culprit is faulty cat or faulty post-cat o2 sensors. i read that faulty cat can cause error to the o2 sensors because the cat does not filter out the smoke thus making the o2 sensors dirty. nonetheless my butt dyno tells me there's improvement in acceleration and fuel consumption after all the replacements made above, and i think i can trust what my but tells me. next step to get my cat checked.has anybody experienced the same before?