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I’d recommend stock bmw plugs, Gapped to .018-.020 for a tuned car. I’ve seen quite a few cars come in misfiring with aftermarket plugs... even bosh. I’m not sure if there is a difference between the bmw ones and the bosh replacement ones (maybe just installation error) but that’s my experience.
Also an intake leak or Crankcase leak could cause misfires like that. I would replace that broken hose while your in there. Could also be a leaking injector or bad coil... take note if any of the plugs are wet or fouled when you remove them.
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