Your not the first guy to run into problems trying to jet a Stage 1 setup to work with a K&N Filter. IIRC both Dale & Ivan's both advise using a stock filter. Dale then came up with the Full Back Off Air Filter cover arrangement, and that seems to work., but normally part of a full change, including header pipes.
So a search of the site, and you should find some previous posts. I believe Fast Larry's site used to have some data on it as well. Maybe Red01 will remember, if he logs on. He doesn't post here as often, since he moved on to a C14
Sorry, I know that doesn't really help answer you question.