I know i sounds like a broken record but i worked on a setup recently with nearly identical symptoms to yours, we changed everything ! and the problem was fixed with a bottle of fuel system cleaner from supercheap. Not saying this will definitely fix yours but sometimes its the simple things that are overlooked.
I dont think you should rely on your wide-band 100% for fault finding your fuel system as the sensor is downstream from your engine. The miss-fire may only be minuscule and in one cylinder - it may not be enough for your wideband to accurately capture as some can have a slow-ish response rate.
Maybe just remove your injectors, tap them out and see if there is any debris, get a good bottle of fuel system clean from supercheap and run it in for a bit. At least these steps wont chew your wallet and only cost you a little bit of time.
Good luck dude
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