Cylinder 5 and 6 spark plug wires were contaminating O2 sensor signals because they were zip-tied with O2 sensor wiring. I overlooked this possibility because the spark plug wires looked very well insulated but the voltage running through them was high enough to cause enough EMI. Fixed the problem and re-logged. Car was pulling strong but timing corrections have gotten worse compare to the last logs on stock coils. It could've happened because of PR coils but IAT was higher this time.