Those tubes, big and small don't have a straw in them as they are airless pump dispensers so there has to be contact between the liquid CC cream in the tube and the top of the pump. Try storing the tube upside down and bang the top of the tube on your hand to get the cream down toward the top of the tube.
Once the tube looks empty there's still a lot of product stuck to the inside tube walls. If nothing works to get the CC cream out, you may have to cut the bottom of the tube and use a small foundation brush or concealer brush to get the CC cream out of the tube. If you cut the tube, put it in a plastic bag so the tube doesn't dry out.