Might run better ad ne a bit more easy to tune if you swapped the needle valve assembly around, put the needle at the top. Will shorten the fuel line run and be lots easier to adjust the needle. You can shorten the spring a bit also, just unscrew the knob, cut the spring in hall, screw the knob back on, put a touch of CA on it to help hold it.. You will notice that it doesn't shake like a tuning fork that way, and that can affect the needle setting and how the engine runs. If you see the spring shaking all over the place, the pointy end can also. They are connected.
Type at you later,
Dan McEntee