BLP makes a needle and seat that only discharges from the bottom, and they claim that prevents aeration of the fuel in the bowl. The idea is that fuel enters below the liquid line, not splashed over it (at least, that's the way I understand it).
Their website shows a modified carb with windows cut in the bowls, and on one bowl using their needle and seat the fuel is clear, while the other bowl with the standard needle and seat the fuel looks all cloudy, presumably aerated.
If you have experience and/or KNOWLEDGE of how these bottom feeders work, please share your thoughts!!!