Long intakes favor low rpms.
And you’re not making any power at low rpms with this kit and the pipe..
They don’t match. So wicking up is impossible.
You either have to run a shorter cutout out the side, or make a new intake that’s angled downwards and shorter and straight from the carb to the reeds.
I can see what’s happening now. The fuel mix is probably sticking then dripping along that first curve due to lower velocity from those curves.. then it drops down the top of the tube and drips right at the intake to the carb. Raw fuel dripping at the inlet of the Venturi is gonna fuck up your mix strangely and there’s no solution except for a better designed intake