Great to hear you've found a needle/jetting that works well, it's very satisfying to get your carb working nicely.
I've just spent the last few weeks experimenting with the N1EG needle, getting my EC300 jetted where I want it.
I was wondering what a XC327 is?
I'm guessing it's a XC300 with a big bore kit? Is that correct?
All the best, Dave.