Nice write up !
yet another trick--is to increase the length of the passage from the rotary valve (whatever --to the carb.
This can reduce the sudden peak in the column of air which is flowing from the carb-to the engine.
I once did a lot of work involving low pressure pneumatic systems and developed some innovations using the overshoot and imbalances in double acting cycinders to trigger auto shutdown for safety purposes.
This plus working with fluidic circuitry, showed me the highly elastic nature of air can be both a problem and in some cases used to help tailor airflow .
Bill in 1960 I traded a beautiful Olds 88 4door rare torpedo back for a Moss cart with dual Mac 10's - I got it to go fast but it darn near killed me
I traded it to a race boat guy for a built up Chev engine for my 55 Austin Healey- with a 6 carb Offy log manifold which was wretched on the street -simply because of poor carb velocity at low revs -
Long way around to get to the issue at hand but I ended up using a three carb progressive setup to get best street racer performance . The spit back and other problems we see with th model engines are similar to problems seen with cars.