Just throw the 180 in. If you deem it too rich then get the 178. A lot of people are content with the n1ef so it's hardly an urgent change. It's a very rich needle anyway, so it's safe to leave it.
I know when I got my first 2 stroke I spent days reading forum posts I'd pulled up with Google and my head felt like it was going to rot and fall off. Point is don't over think it.
That reed spacer isn't going to have a measurable change.
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