You can not use the airbox side for a depression (vacuum). The airbox is designed to be a low restiction, hence the difference between atmospheric pressure and the inlet to the carburettor is small.
Therefore no depression (vacuum) at low speeds/loads. The reed side does offer significant restriction when the slide is closed or part way open causing the tap to open. At high engine speeds or loads when the slide is fully open the airflow past the point where the tapping is acts as a diffuser and draws air out (or fuel if your tap has a failed diaphragm). This needs to be around 1 or 1.5 mm to work properly.
This brings me to the oil feed you put in. It is simply too big, the depression across the hole will not be large enough to disperse the oil and you will end up with blobs going through. Not what you need to lubricate, you need a mist. If you look at the stndard part, this should give you an idea of what you need. Blobs will not lubricate and will cause poor running until the bearings seize because they have no lubrication.
I would take out the nipple you have put in and use Devcon or JB weld to glue the KR oil feed into the hole, hanging about 10mm into the carb throat.
Connect your oil pump to that and it will work fine. You will have to experiment with the setting, but if you keep backing it off until it is barely smoking it will be fine.
