Whilst I hope for your sake the noise stops - I bet it wont.
IRR3's comment re the secondary helps stifle the symptoms but not the cause.
My R3 has the secondaries different in every gear (and not stock) - And I've pissed about with them for ages to archive a different goal. Makes no difference - if the K&N's are wont to slap like a wet halibut at a given RPM - they always will to some extent - it's pure physics. Simply they're a filter that happens to fit but not necessarily the right one for the engine. They make no attempt to direct and flow air correctly. They mess up fuelling around 2250rpm something rotten.
I tell you: it was may major worry when I fitted the prototype RAMAIR - I was really worried it would be as bad, and would have to tell them all that hard work was for nowt. It isn't - thank God!