Remove one of your idle bleed screws and examine the tip. If it is hollow with a hole in the side of it, this functions as a limiter for just how much air you can deny the slow jet emulsifier tube.
The requirement for bigger slows or idle mixture enrichment when using pods or other inlet devices, rather than the stock filter, is completely understandable.
The jet flow volume is based on the pressure differential between the carb throat and the outside atmospheric pressure. The stock filter with its superior particle entrapment features, do so at the expense of some resistance to flow for a given volume of air. This makes an increased pressure drop between the outside atmospheric environment and the carb throats chambers on the other side of the filter media.
At 1000 RPM, the volume or mass of air used is identical whether stock or altered filtration is used. But, the pressure differential IS different, and lower with a less restrictive media. Therefore, a fuel jet orifice will flow less fuel with a lower differential pressure caused by more open filter material. The air bleed adjustment may be enough to restore correct idle mixture. But, the hollow tipped screws have a built in range limiter. When that is reached, a larger slow jet orifice is required.
The CB550F 069A carbs have a different Air Bleed Screw design, as it has a solid tip. With this, you can closed off ALL the air destined to be emulsified with the idle jet fuel source. While it has a wider adjustment range, it can also be quite sensitive to adjust far from stock settings.
Cheers,
