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There hasn't been a lot of evidence these cars are susceptible to LSPI like the Ford and GM engines. I wouldn't floor these cars below 3k because the potential is there and I've seen mild knock on my logs, but most tuners say it isn't a problem. There's oil formulations for the Fords and GMs with lower calcium to help combat it.
Guys on the F30 forum have definitely had superknock from bad gas, a few have gone with custom tunes because they can't source any reliable fuel. There's also plenty of blown up N55s on the E boards. I agree the addition of the lucas booster should have helped, but I ran a few different brands and only a couple get reliable results.
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