Edelbrock 1406 secondary venturi cluster

If you have "secondary bog" then there is something besides the design a fault.
More likely jetting or tuning (as in timing or advance)

Also when you mention pickup tube design differences, did you notice how that secondary second butterfly set works?
That design is so that that top set opens depending on air flow volume (so smaller tubes and jets are a must for that design, as the secondary venturi's have more vacuum on them)