for posterity....figured it out, for anyone who finds this in frustration....
-hold the lower pink rubber, twist the upper pink rubber for adjustment.
-counterclockwise allows for more fill....as you twist the top pink while holding the lower pink the nipple will get longer, so it dips deeper and your fill will stop earlier.
-you only need to adjust shelf level if it wont push the nozzle up enough to get proper flow.
Adam