Are you trying with a fresh batt?
Did you top fill it first to show yourself how it should be working (when your squonking correctly)?
You know these DC's are saturated from squonking when they gurgle and your not pressing the bottle (which you don't want). I have the hang of bottom feeding a DC now but in the beginning, I would often squonk in to much
juice (i.e. - when I was done presing the bottle, the DC still continued to gurgle, and gurgle...the point of oversaturation was reached). When you squonk with a DC, you'll often notice that when you stop pressing the bottle and continue hitting it, the gurgle will stop (this is because the carto is continueing to absorb
juice). When you oversaturate, the DC just keeps gurgling no matter how much you draw on it. When that was the case, I would then just unscrew the carto and lightly blow through from the top into a paper towel to clear it, screw the carto back on, and vape away for at least a hour or so (until I had to re-squonk).
Hope this helps...