I wonder how well a tube about the width and length of a typical spark plug with fuel line and petal valve would work to draw in a rich fuel/air mixture directly into the combustion chamber? If you imagine a front valved Sibley Craft Jet with a Logan side port added, that is one arrangement that reved up fine for me. In a way my little Logan became a valved pulsejet with twin exhausts or maybe you would call it a hybrid.
But if you were to slave a reed valve with venturi tube directly to the side-center of the combustion chamber of a valveless, I feel certain it would farm the low pressure waves, just as a Dynajet head does sitting directly on the combustion chamber of the Dynajet. What I was proposing is that you aspirate a large amount of fuel with only a token of air, a hybrid of say 10% valved engine and the rest valveless activity. Obviously, if the combustion chamber were only a high pressure zone, not even fresh air could get in. With a venturi tube and needle valve with a one-way petal valve gate sitting right next to the "zone", it's going to have first dibs on drawing in air and fuel because of the proximity.
I would love to have a little narrow threaded tube, say 3 inches long with a valve that could be conveniently screwed into pulsejet bodies. And have the "reed venturi tube" equipt with a needle valve akin to the Sibley Craft Jet head, or like you attempted with the needle valve across the opening of your valveless intake.
Perhaps something like this breather valve with a tube sleeved over it would work? Again, the thought is to get fuel/air directly into the heart of a valveless pulsejet using a valved fuel/air Dynajet head aspiration philosophy, only smaller favoring fuel flow over air. Now I don't know how well this would work, but it might be fun to try. Some assembly required. hahttp://www.aerocycleco.com/s&s%20breath ... ve%201.jpg