As Anthony noted in the CarlosG Spyder breather thread, the CB oil filler/breather tower does not seem to have enough volume(and they leak).
My friend Brian got the CB filler/breather on his 2332 and it does not work much at all. Puking oil from his crank pulley like crazy. He has a CB thinline 1.5 quart sump extension, so I told him to lower the oil level. But he has no VC vents, and only the filler/breather with the fuel pump blockoff plumbed to the CB unit.
In short, he(and you) need to ditch that unit for one with some volume. I think it is important to have a good deal of volume in the bottom and the scrubber pads in a much smaller area at the top. My homemade tube is about a quart in volume, has two SS Chore boy pads in the top end(one tube to one carb), size 1/2" ID. Each VC has a 1/2" vent tube. I also ran a huge 1" ID hose from the distributor hole to the breather. It works pretty darn well with the dry sump pump. I also have a 1/2" hose from the dry sump tank to the carb top. I used some nylon elbows in the system and they were small ID, so they all got drilled out to a 1/2" ID.
I don't seem to get any residue at all in the right carb where both vents go.
I know they are expensive, but both CSP and RLR make some really nice breathers that can be mounted on the firewall.